Summary of Significant Accounting Policies (Policies)	6 Months Ended
Summary of Significant Accounting Policies (Policies)	Jun. 30, 2017
Accounting Policies [Abstract]
Basis of Accounting	Basis for Preparation of Consolidated Financial Statements The unaudited consolidated financial statements are presented pursuant to the rules and regulations of the Securities and Exchange Commission. In our opinion, these statements include all adjustments necessary for a fair presentation of the results of the interim periods reported herein. Adjustments consist only of normal recurring items, except for any discussed in the notes below. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted as permitted by such rules and regulations. Estimates are required for the preparation of financial statements in accordance with GAAP and actual results could differ from these estimates. Refer to Note 2. Summary of Significant Accounting Policies in this Quarterly Report on Form 10-Q and in our Annual Report on Form 10-K for the year ended December 31, 2016 for a discussion of our significant accounting policies.
Basis of Consolidation	All significant intercompany accounts and transactions are eliminated in consolidation. We consolidate entities over which we have control, usually evidenced by a direct ownership interest of greater than 50%, and variable interest entities where we are determined to be the primary beneficiary. Refer to Note 5. Other Assets for further information regarding our variable interest entities. For affiliates we do not control but over which we have significant influence on financial and operating policies, usually evidenced by a direct ownership interest from 20% to 50%, the investment is accounted for using the equity method. Prior to January 1, 2016, we consolidated the operating results of Pullmantur Holdings on a two-month reporting lag to allow for more timely preparation of our consolidated financial statements. Effective January 1, 2016, we eliminated the two-month reporting lag to reflect Pullmantur Holding's financial position, results of operations and cash flows concurrently and consistently with the fiscal calendar of the Company (the "elimination of the Pullmantur reporting lag"). The elimination of the Pullmantur reporting lag represented a change in accounting principle which we believed to be preferable because it provided more current information to the users of our financial statements. A change in accounting principle requires retrospective application, if material. The impact of the elimination of the reporting lag was immaterial to prior periods and was immaterial for our fiscal year ended December 31, 2016. As a result, we have accounted for this change in accounting principle in our consolidated results for the first quarter of 2016. Accordingly, the results of Pullmantur Holdings for November and December 2015 are included in our statement of comprehensive income (loss) for the six months ended June 30, 2016. The effect of this change was a decrease to net income of $21.7 million, which has been reported within Other expense in our consolidated statements of comprehensive income (loss) for the six months ended June 30, 2016.
New Accounting Pronouncements	Recent Accounting Pronouncements Revenue from Contracts with Customers In May 2014, amended GAAP guidance was issued to clarify the principles used to recognize revenue for all entities. The guidance also requires more detailed disclosures and provides additional guidance for transactions that were not comprehensively addressed in the prior accounting guidance. This guidance must be applied using one of two retrospective application methods and will be effective for our annual reporting period beginning after December 15, 2017, including interim periods therein. We have made significant progress toward completing our evaluation of potential changes to our core revenues using the five-step model supported by the new revenue standard. Based on our preliminary assessment, we do not expect the adoption of the new standard to materially change the timing of recognition of our core revenues, but we do anticipate enhancing our disclosures with respect to our revenue recognition policies in compliance with the new standard. We will continue to evaluate the impact of adopting this new standard on our consolidated financial statements, and expect to have our evaluation completed during the fourth quarter of fiscal 2017. Upon adoption, we intend to elect the modified retrospective method. This will involve applying the guidance retrospectively only to the most current period presented in the consolidated financial statements and recognizing the cumulative effect of initially applying the guidance as an adjustment to the January 1, 2018 opening balance of retained earnings. Leases In February 2016, amended GAAP guidance was issued to increase the transparency and comparability of lease accounting among organizations. For leases with a term greater than 12 months, the amendments require the lease rights and obligations arising from the leasing arrangements, including operating leases, to be recognized as assets and liabilities on the balance sheet. The amendments also expand the required disclosures surrounding leasing arrangements. The guidance must be applied using a retrospective application method and will be effective for financial statements issued for fiscal years beginning after December 15, 2018 and interim periods within those years. Early adoption is permitted. We are currently evaluating the impact of the adoption of this newly issued guidance to our consolidated financial statements. Classification of Certain Cash Receipts and Cash Payments In August 2016, amended GAAP guidance was issued to clarify how certain cash receipts and cash payments are presented and classified in the statement of cash flows. The amendments are aimed at reducing the existing diversity in practice. The guidance should be applied using a retrospective transition method to each period presented and will be effective for annual periods beginning after December 15, 2017 and interim periods within those annual periods. Early adoption is permitted, including adoption in an interim period. We intend to adopt the guidance on the date of initial application, January 1, 2018. The adoption of this newly issued guidance is not expected to have a material impact to our consolidated financial statements. Intra-Entity Transfers of Assets Other Than Inventory In October 2016, amended GAAP guidance was issued that requires the income tax consequences of an intra-entity transfer of an asset, other than inventory, to be recognized at the time that the transfer occurs, rather than when the asset is sold to an outside party. The new guidance is effective for annual and interim reporting periods beginning after December 15, 2017. Early adoption is permitted as of the beginning of an annual period for which financial statements have not been issued. The guidance is required to be adopted retrospectively by recording a cumulative-effect adjustment to retained earnings as of the beginning of the adoption period. The adoption of this newly issued guidance is not expected to have a material impact to our consolidated financial statements. Service Concession Arrangements In May 2017, amended GAAP guidance was issued to reduce the diversity in practice in accounting for service concession arrangements. The amendments in this updated guidance provide clarity in determining the customer in a service concession arrangement and enables more consistent application of other aspects of the revenue guidance, which are affected by this customer determination. This guidance must be applied using one of two retrospective application methods and will be effective for our annual reporting period beginning after December 15, 2017, including interim periods therein. We are currently evaluating the impact of the adoption of this newly issued guidance to our consolidated financial statements.
Other	Other Revenues and expenses include port costs that vary with guest head counts.
Reclassification	Reclassifications For the second quarter and six months ended June 30, 2016, restructuring charges of $4.4 million and $4.7 million, respectively, have been reclassified into Marketing, selling and administrative expenses in the consolidated statements of comprehensive income (loss) in order to conform to the current year presentation. For the six months ended June 30, 2016, share-based compensation expense of $13.3 million, equity investment income of $48.3 million and amortization of debt issuance costs of $14.7 million, have been reclassified in the consolidated statements of cash flows from Other, net to Share-based compensation expense, Equity investment income and Amortization of debt issuance costs, respectively, within Net cash provided by operating activities in order to conform to the current year presentation. Additionally, for the six months ended June 30, 2016, amortization of debt issuance costs of $7.7 million and $3.5 million, have been reclassified from Increase in prepaid expenses and other assets and from Decrease (increase) in accrued expenses and other liabilities, respectively, in the consolidated statements of cash flows to Amortization of debt issuance costs, within Net cash provided by operating activities in order to conform to the current year presentation.