Document and Entity Information Document Information [Table] Document Information [Line Items] Document Type Document Quarterly Report Document Transition Report Document Period End Date Entity File Number Entity Registrant Name Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line Two Entity Address, City or Town Entity Address, State or Province Entity Address, Postal Zip Code City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Security Exchange Name Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Central Index Key Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Period Focus Amendment Flag CONDENSED CONSOLIDATED BALANCE SHEETS Statement [Table] Class of Stock [Axis] Class of Stock [Domain] Represents information relating to redeemable preferred units. Redeemable Preferred Units Represents information relating to redeemable common units. Redeemable Common Units Statement [Line Items] Statement Assets [Abstract] ASSETS Segment Assets Assets, Current [Abstract] Current Assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Restricted Cash and Cash Equivalents, Current Restricted cash Short-term Investments Short-term investments Accounts Receivable, Net, Current Accounts receivable, net of allowances for credit losses of $15.0 million and $13.9 million, respectively Amount receivable from customers due within one year or the normal operating cycle, if longer. Customer Receivable, Current Customer receivable Customer receivable, current Inventory, Gross Inventory, materials and supplies Prepaid Expense and Other Assets, Current Prepayments and other current assets Assets, Current Total current assets Total current assets Property, Plant and Equipment, Net [Abstract] Fixed Assets: Property, Plant and Equipment, Gross Property, plant and equipment Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less accumulated depreciation Property, Plant and Equipment, Net Net fixed assets Fixed assets, net Indefinite-Lived License Agreements Telecommunication licenses, net Goodwill Goodwill Finite-Lived Intangible Assets, Net Intangible assets, net Operating Lease, Right-of-Use Asset Operating lease right-of-use assets Amount receivable from customers classified as noncurrent. Customer Receivable, Noncurrent Customer receivable - long term Other Assets, Noncurrent Other assets Assets Total assets Total assets Liabilities and Equity [Abstract] LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY Liabilities, Current [Abstract] Current Liabilities: Long-term Debt, Current Maturities Current portion of long-term debt Amount, after unamortized (discount) premium and debt issuance costs, of customer receivable credit facility, classified as current. Customer Receivable Credit Facility, Current Maturities Current portion of customer receivable credit facility Accounts Payable and Accrued Liabilities, Current Accounts payable and accrued liabilities Dividends Payable, Current Dividends payable Accrued Income Taxes, Current Accrued taxes The amount of lease liability current. Lease Liability, Current Current portion of lease liabilities Represents the information pertaining to advance payments and deposits current. Advance Payments And Deposits Current Advance payments and deposits Liabilities, Current Total current liabilities Total current liabilities Deferred Income Tax Liabilities, Net Deferred income taxes The amount of lease liability noncurrent. Lease Liability, Noncurrent Lease liabilities, excluding current portion Other Liabilities, Noncurrent Other liabilities Amount after unamortized (discount) premium and debt issuance costs of customer receivable credit facility classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Customer Receivable Credit Facility, Excluding Current Maturities Customer receivable credit facility, net of current portion Long-term Debt, Excluding Current Maturities Long-term debt, excluding current portion Liabilities Total liabilities Commitments and Contingencies. Commitments and contingencies (Note 14) Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests Ending balance Beginning balance Total redeemable noncontrolling interests Redeemable noncontrolling interests Stockholders' Equity Attributable to Parent [Abstract] ATN International, Inc. Stockholders' Equity: Preferred Stock, Value, Issued Preferred stock, $0.01 par value per share; 10,000,000 shares authorized, none issued and outstanding Common Stock, Value, Issued Common stock, $0.01 par value per share; 50,000,000 shares authorized; 17,562,666 and 17,476,542 shares issued, respectively, 15,742,780 and 15,712,941 shares outstanding, respectively Treasury Stock, Common, Value Treasury stock, at cost; 1,819,885 and 1,763,601 shares, respectively Additional Paid in Capital, Common Stock Additional paid-in capital Retained Earnings (Accumulated Deficit) Retained earnings Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income Stockholders' Equity Attributable to Parent Total ATN International, Inc. stockholders' equity Stockholders' Equity Attributable to Noncontrolling Interest Noncontrolling interests Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Balance, end of period Balance, beginning of period Total equity Liabilities and Equity Total liabilities, redeemable noncontrolling interests and equity Allowance for Doubtful Accounts Receivable, Current Accounts receivable, allowances (in dollars) Allowance for credit loss Preferred Stock, Par or Stated Value Per Share Preferred stock, par value (in dollars per share) Preferred Stock, Shares Authorized Preferred stock, shares authorized Preferred Stock, Shares Issued Preferred stock, shares issued Preferred Stock, Shares Outstanding Preferred stock, shares outstanding Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common stock, shares issued Common Stock, Shares, Outstanding Common stock, shares outstanding Treasury Stock, Common, Shares Treasury stock, shares CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS Products and Services [Axis] Products and Services [Domain] This represents the transactions related to communication services. Communication services Construction This represents the transactions related to other. Other revenue Revenues [Abstract] REVENUE: Revenue Revenue from Contract with Customer, Excluding Assessed Tax Total revenue Revenue Operating Expenses [Abstract] OPERATING EXPENSES (excluding depreciation and amortization unless otherwise indicated): Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization Cost of services Selling, General and Administrative Expense Selling, general and administrative Transaction related charges Transaction-related charges Depreciation Depreciation and amortization Amortization of Intangible Assets Amortization of acquisition intangibles Amortization of intangibles from acquisitions Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Loss on disposition of long-lived assets Loss on disposition of long-lived assets Operating Expenses Total operating expenses Operating Income (Loss) Operating income (loss) Income from operations Nonoperating Income (Expense) [Abstract] OTHER INCOME (EXPENSE) Other interest income (expense) pertaining to nonoperating. Other Interest Income Expense Nonoperating Interest income Interest Expense Interest expense Other Nonoperating Income (Expense) Other income Nonoperating Income (Expense) Other income (expense), net Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Income (Loss) from Continuing Operations before Income Taxes INCOME BEFORE INCOME TAXES Income Tax Expense (Benefit) Income tax provision Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income (loss) NET INCOME (LOSS) Net income Net Income (Loss) Attributable to Noncontrolling Interest Net income (loss) attributable to noncontrolling interests, net of tax expense (benefit) of $(0.5) million and $0.1 million, respectively. Net Income (Loss) Available to Common Stockholders, Basic Net loss attributable to ATN International, Inc. stockholders NET INCOME (LOSS) ATTRIBUTABLE TO ATN INTERNATIONAL, INC. STOCKHOLDERS Net Income attributable to ATN International, Inc. Stockholders Earnings Per Share, Basic and Diluted [Abstract] NET INCOME (LOSS) PER WEIGHTED AVERAGE SHARE ATTRIBUTABLE TO ATN INTERNATIONAL, INC. STOCKHOLDERS: Earnings Per Share Earnings Per Share, Basic Basic (in dollars per share) Earnings Per Share, Diluted Diluted (in dollars per share) Weighted Average Number of Shares Outstanding, Diluted [Abstract] WEIGHTED AVERAGE COMMON SHARES OUTSTANDING: Reconciliation from basic to diluted weighted average common shares outstanding Weighted Average Number of Shares Outstanding, Basic Basic (in shares) Weighted-average shares outstanding- Basic Weighted Average Number of Shares Outstanding, Diluted Diluted (in shares) Weighted-average shares outstanding- Diluted Common Stock, Dividends, Per Share, Declared DIVIDENDS PER SHARE APPLICABLE TO COMMON STOCK Dividends declared on common stock (dollars per per share) Amount of current income tax expense (benefit) reported by noncontrolling interests. Noncontrolling Interest Income Tax Expense Benefit Noncontrolling interest income tax expense (benefit) CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive income (loss): Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Foreign currency translation adjustment Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Unrealized gain (loss) on derivatives Other Comprehensive Income (Loss), Net of Tax Other comprehensive income (loss), net of tax Other comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive income (loss) Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest Less: Comprehensive income (loss) attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income (loss) attributable to ATN International, Inc. CONDENSED CONSOLIDATED STATEMENTS OF EQUITY Equity Components [Axis] Equity Component [Domain] Total ATNI Stockholders' Equity Common Stock Treasury Stock, at cost Additional Paid In Capital Retained Earnings Redeemable common units included in permanent parent equity. Redeemable Common Units. Accumulated Other Comprehensive Income/(Loss) Non-Controlling Interests Increase (Decrease) in Temporary Equity [Roll Forward] Increase (decrease) in temporary equity Temporary Equity, Accretion of Dividends Accrued dividend - redeemable preferred units Accrued preferred dividend Represents a deemed dividend in temporary equity. Temporary Equity Deemed Dividend Deemed dividend - redeemable common unit Change in fair value Temporary Equity, Net Income Net income (loss) Allocated net loss Amount of other comprehensive income or loss attributable to temporary equity interest. Temporary Equity, Other Comprehensive Income (Loss) Total comprehensive income Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity Treasury Stock, Value, Acquired, Cost Method Purchase of shares of common stock Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock-based compensation Dividends, Common Stock Dividends declared on common stock Dividends, Common Stock, Stock Accrued dividend Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Distributions to non-controlling interests Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Repurchase of non-controlling interests Amount of deemed dividend declared during the reporting period. Deemed Dividend Deemed dividend Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Comprehensive income (loss): Treasury Stock, Shares, Acquired Purchase of shares of common stock CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash flows provided by operating activities: Provision for Doubtful Accounts Provision for doubtful accounts Current period provision for expected losses Amortization of Financing Costs and Discounts Amortization of debt discount and debt issuance costs Share-based Compensation Stock-based compensation Non-cash stock-based compensation Deferred Income Tax Expense (Benefit) Deferred income taxes Income (Loss) from Equity Method Investments Loss on equity investments Gain on equity investments Foreign Currency Transaction Gain (Loss), before Tax Unrealized gain on foreign currency Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities, excluding the effects of acquisitions and dispositions: Increase (Decrease) in Accounts Receivable Accounts receivable The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers. Increase (Decrease) in Customer Receivable Customer receivable The net change during the reporting period in the value of materials and supplies held in inventory, prepayments, and other current assets. Increase (Decrease) in Inventory, Prepayments, and Other Current Assets Materials and supplies, prepayments, and other current assets Increase (Decrease) in Prepaid Taxes Prepaid income taxes This element represents the net change during the reporting period in the aggregate amount of obligations and expenses incurred but not paid, which also includes the amount of prepayment by customers for goods or services to be provided and the amount of customer money held in customer accounts, which may also include other current liabilities. Increase (Decrease) in Accounts Payable and Accrued Liabilities Advance Payments and Deposits and Other Current Liabilities Accounts payable and accrued liabilities, advance payments and deposits and other current liabilities Increase (Decrease) in Income Taxes Payable Accrued taxes Increase (Decrease) in Other Operating Assets Other assets Increase (Decrease) in Other Operating Liabilities Other liabilities Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities: The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets, excluding assets purchased for the hurricane rebuild. Payments To Acquire Property Plant And Equipment Excluding Hurricane Rebuild Capital expenditures The cash outflow associated with the reimbursable capital expenditure. Reimbursable Capital Expenditures Reimbursable capital expenditures Cash inflow from government grants. Proceeds From Government Grants Receipt of capital government grants Proceeds from Divestiture of Businesses, Net of Cash Divested Divestiture of businesses, net of transferred cash of $0.9 million Payments to Acquire Businesses and Interest in Affiliates Purchases of strategic investments Payment for investment Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities