| Significant Accounting Policies (Policies) | 12 Months Ended |
| Dec. 31, 2023 |
| Accounting Policies [Abstract] | |
| Basis of Accounting, Policy [Policy Text Block] | Basis of Presentation The consolidated financial statements include the accounts of the Company after elimination of all intercompany accounts and transactions. The consolidated financial statements and accompanying footnotes have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (the “SEC”). The presentation of prior period marine operating supply and inventory on the consolidated balance sheets has been combined with prepaid expenses and other current assets to conform to the 2023 no |
| Use of Estimates, Policy [Policy Text Block] | Use of Estimates The preparation of consolidated financial statements requires management to make estimates and assumptions that affect the reported amounts of certain assets and liabilities as well as revenues and expenses and related disclosures. Actual results could differ from such estimates. Management estimates include determining the estimated lives of long-lived and intangible assets, the valuation of stock-based compensation awards, future travel certificate breakage, annual goodwill impairment assessment, and the recovery of deferred tax assets. Estimates and assumptions are reviewed periodically and the effects of revisions are reflected in the consolidated financial statements in the period that they are determined to be necessary. |
| Revenue from Contract with Customer [Policy Text Block] | Revenue Recognition Revenues are measured based on consideration specified in the Company’s contracts with guests and are recognized as the related performance obligations are satisfied. The majority of the Company’s revenues are derived from guest ticket contracts which are reported as tour revenues. The Company’s primary performance obligation under these contracts is to provide an expedition, trip or tour, and may Tour revenues also include revenues from the sale of goods and services onboard the Company’s ships, cancellation fees and trip insurance. Revenues from the sale of goods and services rendered onboard are recognized upon purchase. Guest cancellation fees are recognized as tour revenues at the time of the cancellation. The Company records a liability for estimated trip insurance claims based on the Company’s claims history. Proceeds received from trip insurance premiums in excess of this liability are recorded as revenue in the period in which they are received. The Company sources its guest bookings through a combination of direct selling and various agency networks and alliances. The following table disaggregates tour revenues by the sales channel it was derived from: For the years ended December 31, 2023 2022 2021 Guest ticket revenue: Direct 53 % 50 % 56 % National Geographic 12 % 14 % 14 % Agencies 19 % 20 % 18 % Affinity 6 % 5 % 5 % Guest ticket revenue 90 % 89 % 93 % Other tour revenue 10 % 11 % 7 % Tour revenues 100 % 100 % 100 % |
| Customer Deposits and Contract Liabilities, Policy [Policy Text Block] | Customer Deposits and Contract Liabilities The Company’s guests remit deposits in advance of tour embarkation. Guest deposits consist of guest ticket revenues as well as revenues from the sale of pre- and post-expedition excursions, hotel accommodations, land-based expeditions and certain air transportation. Guest deposits represent unearned revenues and are reported as unearned passenger revenues when received and are subsequently recognized as tour revenue over the duration of the expedition. The Company does not no received is being recognized as a discount to tour revenues at the time the related expedition occurs and includes an estimate of breakage based on historical behavior of the customer and/or time to expiration of the certificate. As of December 31, 2023 2022 The change in contract liabilities within unearned passenger revenues are as follows: Contract Liabilities (In thousands) Balance as of December 31, 2022 $ 178,198 Recognized in tour revenues during the period (548,052 ) Additional contract liabilities in period 463,760 Balance as of December 31, 2023 $ 93,906 |
| Cost of Revenue, Policy [Policy Text Block] | Cost of Tours Cost of tours represents the direct costs associated with revenues during expeditions, trips and tours, including costs of pre- or post-expedition excursions, hotel accommodations, land-based expeditions, air and other transportation expenses and costs of goods and services rendered onboard, payroll and related expenses for shipboard, guides and expedition personnel, food costs for guests and crew, fuel and related costs and other expenses such as land costs, port costs, repairs and maintenance, equipment expense, drydock, ship insurance and charter hire expenses. |
| Selling, General and Administrative Expenses, Policy [Policy Text Block] | General and Administrative Expense General and administrative expenses primarily represent the costs of the Company’s shore-side vessel support, credit card commissions, reservations and other administrative functions, and includes salaries and related benefits, professional fees and occupancy costs. Selling and Marketing Expense Selling and marketing expenses include commissions, royalties and a broad range of advertising and marketing expenses. These include advertising costs of direct mail, email, digital media, traditional media, travel agencies and brand websites, as well as costs associated with website development and maintenance, social media and corporate sponsorship costs. Advertising is charged to expense as incurred. Advertising expenses totaled $33.2 million, $31.6 million and $19.1 million for the years ended December 31, 2023, 2022 2021, December 31, 2023, 2022 2021 |
| Cash and Cash Equivalents, Policy [Policy Text Block] | Cash and Cash Equivalents The Company considers all highly liquid instruments with an original maturity of six As of December 31, 2023 2022 2021 (In thousands) Cash and cash equivalents $ 156,845 $ 87,177 $ 150,753 Restricted cash 30,499 28,847 21,940 Total cash, cash equivalents and restricted cash as presented in the statement of cash flows $ 187,344 $ 116,024 $ 172,693 |
| Concentration Risk, Credit Risk, Policy [Policy Text Block] | Concentration of Credit Risk The Company maintains cash in several financial institutions in the U.S. and other countries which, at times, may December 31, 2023 2022, |
| Restricted Cash and Marketable Securities [Policy Text Block] | Restricted Cash and Marketable Securities The amounts held in restricted cash represent principally funds required to be held by certain vendors and regulatory agencies and are classified as restricted cash since such amounts cannot be used by the Company until the restrictions are removed by those vendors and regulatory agencies. These amounts are principally held in certificates of deposit and interest income is recognized when earned. In order to operate guest tour expedition vessels from U.S. ports, the Company is required to either post a performance bond with the Federal Maritime Commission or escrow all unearned guest deposits plus an additional 10% Restricted cash and marketable securities consist of the following: As of December 31, 2023 2022 (In thousands) Credit card processor reserves $ 20,250 $ 20,400 Federal Maritime Commission and other escrow 8,958 6,882 Certificates of deposit and other restricted securities 1,291 1,565 Total restricted cash $ 30,499 $ 28,847 The Company has classified marketable securities, principally money market funds or other short-term investments, as trading securities which are recorded at market value. Unrealized gains and losses are included in current operations. Gains and losses on the disposition of securities are recognized by the specific identification method in the period in which they occur. Cost of these short-term investments approximates fair value. |
| Prepaid Expenses and Other Current Assets [Policy Text Block] | Prepaid Expenses and Other Current Assets The Company records prepaid expenses and other current assets at cost and expenses them in the period the services are provided or the goods are delivered. Marine operating supplies and first first As of December 31, 2023 2022 (In thousands) Prepaid tour expenses $ 26,123 $ 20,605 Marine operating supplies 5,438 9,961 Other 25,597 21,173 Total prepaid expenses and other current assets $ 57,158 $ 53,704 |
| Property, Plant and Equipment, Policy [Policy Text Block] | Property and Equipment, net Property and equipment, net is stated at cost less accumulated depreciation. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, as follows: Years Vessels and vessel improvements 15 - 25 Furniture & equipment 5 Computer hardware and software 5 - 10 Leasehold improvements, including expedition sites and port facilities Shorter of lease term or related asset life The ship-based tour and expedition industry is very capital intensive. As of December 31, 2023, Vessel improvement costs that add value to the Company’s vessels, such as those discussed above, are capitalized and depreciated over the shorter of the improvements, or the vessel’s estimated remaining useful life, while costs of repairs and maintenance, including minor improvement costs and drydock expenses, are charged to expense as incurred and included in cost of tours. Drydock costs primarily represent planned maintenance activities that are incurred when a vessel is taken out of service. For U.S. flagged ships, the statutory requirement traditionally is an annual docking and U.S. Coast Guard inspections, normally conducted in drydock. Internationally flagged ships have scheduled dockings approximately every 12 three six |
| Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] | Goodwill The Company tests for impairment annually as of September 30, not September 30, 2023 no 5—Goodwill |
| Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] | Intangible Assets, net Intangible assets include tradenames, customer lists and operating rights. Tradenames are words, symbols, or other devices used in trade or business to indicate the source of products and to distinguish it from other products and are registered with government agencies and are protected legally by continuous use in commerce. Customer lists are established relationships with existing customers that resulted in repeat purchases and customer loyalty. Based on the Company’s analysis, amortization of the tradenames and customer lists were computed using the estimated useful lives of 15 and 5 years, respectively. See Note 5—Goodwill The Company operates two National Geographic Endeavour II 96 National Geographic Islander II 48 2042, Upon the occurrence of a triggering event, the assessment of possible impairment of the Company’s intangible assets will be based on the Company’s ability to recover the carrying value of its asset, which is determined by using the asset’s estimated undiscounted future cash flows. If these estimated undiscounted future cash flows are less than the carrying value of the asset, an impairment charge is recognized for the excess, if any, of the asset’s carrying value over its estimated fair value. A significant amount of judgment is required in estimating the future cash flows and fair values of its tradenames, customer lists and operating rights. As of and for the year ended December 31, 2023 2022, no |
| Long-Lived Assets [Policy Text Block] | Long-Lived Asset Impairment Assessment The Company reviews its long-lived assets, principally its vessels, for impairment whenever events or changes in circumstances indicate that the carrying amounts of these assets may not December 31, 2023 2022, no |
| Accounts Payable and Accrued Expenses, Policy [Policy Text Bock] | Accounts Payable and Accrued Expenses The Company records accounts payable and accrued expenses for the cost of such items when the service is provided or when the related product is delivered. The Company’s accounts payable and accrued expenses consist of the following: As of December 31, 2023 2022 (In thousands) Accrued other expense $ 48,901 $ 54,418 Accounts payable 16,154 16,601 Total accounts payable and accrued expenses $ 65,055 $ 71,019 |
| Lessee, Leases [Policy Text Block] | Leases The Company leases office and warehousing space with lease terms ranging from one ten three six At the inception of a lease, the Company recognizes right-of-use lease assets and related lease liabilities measured as the present value of future lease payments. The Company's right-of-use lease assets are recorded in other long-term assets and the Company's long-term lease liabilities are recorded in other long-term liabilities. Lease expense is recognized on a straight-line basis over the term of the lease. The Company reviewed its contracts with vendors and customers, determining that its right-to-use lease assets consisted primarily of office space operating leases. In determining the right-to-use lease assets and related lease liabilities, the Company did not 12 |
| Fair Value Measurement, Policy [Policy Text Block] | Fair Value Measurements Fair value is defined as an exit price, representing the amount that would be received upon the sale of an asset or payment to transfer a liability in an orderly transaction between market participants. Fair value is a market-based measurement that is determined based on assumptions that market participants would use in pricing an asset or liability. A three Level 1 Quoted market prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity has the ability to access at measurement date. Level 2 Quoted market prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not Level 3 Significant unobservable inputs for assets or liabilities that cannot be corroborated by market data. Fair value is determined by the reporting entity’s own assumptions utilizing the best information available and includes situations where there is little market activity for the investment. Level 3 no 3 The asset’s or liability’s fair value measurement within the fair value hierarchy is based upon the lowest level of any input that is significant to the fair value measurement. |
| Derivatives, Policy [Policy Text Block] | Derivative Instruments and Hedging Activities Currency Risk not By entering into derivative instrument contracts, the Company exposes itself, from time to time, to counterparty credit risk. Counterparty credit risk is the failure of the counterparty to perform under the terms of the derivative contract. When the fair value of a derivative contract is in an asset position, the counterparty has a liability to the Company, which creates credit risk for the Company. The Company continues to monitor counterparty credit risk as part of its ongoing derivative assessments. The Company’s derivative assets and liabilities consist principally of currency exchange contracts, which are carried at fair value based on significant observable inputs (Level 2 not The Company records derivatives on a gross basis in other long-term assets and/or other liabilities. The accounting for changes in value of the derivative depends on whether or not not The Company applies hedge accounting to interest rate and foreign exchange rate derivatives entered into for risk management purposes. To qualify for hedge accounting, a derivative must be highly effective at reducing the risk associated with the exposure being hedged. In addition, key aspects of achieving hedge accounting are documentation of hedging strategy and hedge effectiveness at the hedge inception and substantiating hedge effectiveness on an ongoing basis. A derivative must be highly effective in accomplishing the hedge objective of offsetting changes in the cash flows of the hedged item for the risk being hedged. The effective portion of changes in the fair value of derivatives designated in a hedge relationship and that qualify as cash flow hedges is recorded in accumulated other comprehensive income, net of tax, and is subsequently reclassified into earnings in the period that the hedged transaction affects earnings. The Company formally documents the relationship between derivatives and hedged items, as well as the risk-management objective and the strategy for undertaking hedge transactions at the inception of the hedging relationship. This documentation includes linking cash flow hedges to specific assets and liabilities on the balance sheet or to specific forecasted transactions. The Company also formally assesses, both at the hedge’s inception and on an ongoing basis, whether the derivative instruments that are used are highly effective in offsetting changes in fair values or cash flows of the hedged items. |
| Income Tax, Policy [Policy Text Block] | Income Taxes The Company is subject to income taxes in both the U.S. and the non-U.S. jurisdictions in which it operates. Significant management judgment is required in projecting ordinary income to determine the Company’s estimated effective tax rate. The Company accounts for income taxes using the asset and liability method, under which it recognizes deferred income taxes for the tax consequences attributable to differences between the financial statement carrying amounts and the tax bases of existing assets and liabilities, as well as for tax loss carryforwards and tax credit carryforwards. The Company measures deferred tax assets and liabilities using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recoverable or settled. The Company provides a valuation allowance against deferred tax assets if, based upon the weight of available evidence, the Company does not not” The Company regularly assesses the potential outcome of current and future examinations in each of the taxing jurisdictions when determining the adequacy of the provision for income taxes. The Company has only recorded financial statement benefits for tax positions which it believes are “more-likely-than- not” The Company is subject to tax audits in all jurisdictions for which it files tax returns. Tax audits by their very nature are often complex and can require several years to complete. Currently, there are no four five |
| Other Long-term Assets [Policy Text Block] | Other Long-Term Assets Other long-term assets include the Company’s right-to-use lease assets, deferred tax assets and long-term prepaid value-added taxes, which include those related to the importation of the National Geographic Islander II National Geographic Endeavour II |
| Debt, Policy [Policy Text Block] | Deferred Financing Costs Deferred financing costs relate to the issuance costs of debt liabilities and are a direct deduction from the debt carrying amount. Deferred financing costs are amortized over the life of the debt or loan agreement through interest expense, net. See Note 6—Long |
| Foreign Currency Transactions and Translations Policy [Policy Text Block] | Foreign Currency Translation The Company’s functional currency is the U.S. dollar. Any foreign operations and remeasurement adjustments and gains or losses resulting from foreign currency transactions are recorded as foreign exchange gains or losses. |
| Share-Based Payment Arrangement [Policy Text Block] | Stock-Based Compensation Stock-based compensation awards issued to employees, non-employee directors or other service providers are recorded at their fair value on the date of grant and amortized over the service period of the award. The Company recognizes stock-based compensation costs on a straight-line basis over the requisite service period of the award, which is generally the vesting term of the equity instrument issued, within general and administrative expenses. |
| Stockholders' Equity Note, Redeemable Preferred Stock, Issue, Policy [Policy Text Block] | Series A Redeemable Convertible Preferred Stock The Company’s Series A redeemable convertible preferred stock (“Preferred Stock”) is accounted for as a temporary equity instrument. The redemption or conversion of the Preferred Stock into shares of the Company’s common stock is not six six not 11—Stockholders’ |
| New Accounting Pronouncements, Policy [Policy Text Block] | Recent Accounting Pronouncements During November 2023, 2023 07 Segment Reporting (Topic 280 Improvements to Reportable Segment Disclosures 2023 07 December 15, 2023 December 15, 2024. January 1, 2024 January 1, 2025 During December 2023, 2023 09 Income Taxes (Topic 740 Improvements to Income Tax Disclosures 2023 09 December 15, 2024. January 1, 2025 |
