Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Gross amount of port costs included in passenger ticket revenues	$ 143,400	$ 140,000	$ 277,900	$ 284,400
Share-based compensation expense			(35,379)	(13,330)
Equity investment income	(23,359)	$ (27,268)	(35,239)	(48,292)
Amortization of debt issuance costs			$ (26,035)	(25,847)
Reclassification adjustment | Reclassification to Marketing, Selling and Administrative Expenses
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restructuring charges	$ 4,400			4,700
Reclassification adjustment | Amortization of Debt Issuance Costs (Cash Flows-Operating Activities)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amortization of debt issuance costs				(14,700)
Reclassification adjustment | Equity Investment Income (Cash Flows-Operating Activities)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity investment income				(48,300)
Reclassification adjustment | Share-based Compensation Expense (Cash Flows-Operating Activities)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Share-based compensation expense				(13,300)
Reclassification adjustment | Other, net (Cash Flows-Operating Activities) [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Share-based compensation expense				13,300
Equity investment income				48,300
Amortization of debt issuance costs				14,700
Reclassification adjustment | Reclassification From Decrease (Increase) In Prepaid Expenses And Other Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amortization of debt issuance costs				7,700
Reclassification adjustment | Reclassification From Increase In Accrued Expenses and Other Liabilities [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amortization of debt issuance costs				3,500
Reclassification From Decrease (Increase) In Prepaid Expenses And Other Assets [Member] | Amortization of Debt Issuance Costs (Cash Flows-Operating Activities)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amortization of debt issuance costs				(7,700)
Reclassification From Increase In Accrued Expenses and Other Liabilities [Member] | Amortization of Debt Issuance Costs (Cash Flows-Operating Activities)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amortization of debt issuance costs				$ (3,500)