Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Gross amount of port costs included in passenger ticket revenues	$ 134,500	$ 144,400
Share-based compensation expense	17,262	5,765
Share of equity income from investments	11,880	21,026
Amortization of debt issuance costs	13,256	12,365
Dividends received from unconsolidated affiliates	$ 27,997	791
Share-based Compensation Expense (Cash Flows-Operating Activities) | Reclassification adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allocated Share-based Compensation Expense		5,800
Reclassification From Other, net (Cash Flows-Operating Activities) | Reclassification adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Share-based compensation expense		(5,800)
Share of equity income from investments		(21,000)
Amortization of debt issuance costs		(6,700)
Dividends received from unconsolidated affiliates		(800)
Reclassification From Decrease (Increase) In Prepaid Expenses And Other Assets | Reclassification adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amortization of debt issuance costs		(3,900)
Reclassification From Decrease In Accrued Expenses and Other Liabilities | Reclassification adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amortization of debt issuance costs		(1,800)
Equity Investment Income (Cash Flows-Operating Activities) | Reclassification adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Share of equity income from investments		21,000
Amortization of Debt Issuance Costs (Cash Flows-Operating Activities) | Reclassification adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amortization of debt issuance costs		6,700
Amortization of Debt Issuance Costs (Cash Flows-Operating Activities) | Reclassification From Decrease (Increase) In Prepaid Expenses And Other Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amortization of debt issuance costs		3,900
Amortization of Debt Issuance Costs (Cash Flows-Operating Activities) | Reclassification From Decrease In Accrued Expenses and Other Liabilities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amortization of debt issuance costs		1,800
Dividends Received From Unconsolidated Affiliate | Reclassification adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Dividends received from unconsolidated affiliates		800
Reclassification to Marketing, Selling and Administrative Expenses | Reclassification adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restructuring charges		$ 300