Fair Value Measurements and Derivative Instruments (Nonfinancial Instruments) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2021	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Silversea goodwill, impairment				$ 576,208,000
Right-of-use assets, impairment			$ 0	65,900,000
Total, impairment			82,001,000	1,566,380,000	$ 0
Indefinite-life intangible assets, net carrying value	$ 321,475,000		321,475,000	321,475,000
Silversea Cruises (1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Silversea goodwill, impairment		$ 576,200,000		576,208,000
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Indefinite-life intangible asset, impairment				30,800,000
Long-lived assets, impairment	55,213,000			727,063,000
Right-of-use assets, impairment				65,909,000
Equity method investments, impairment				39,735,000
Total, impairment	55,213,000			1,439,715,000
Fair Value, Measurements, Nonrecurring | Silversea Cruises (1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Silversea goodwill, impairment				576,208,000
Fair Value, Measurements, Nonrecurring | Total Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Indefinite-life intangible asset				318,700,000
Long-lived assets	0		0	577,193,000
Right-of-use assets				67,265,000
Equity method investments				0
Total	0		0	1,471,736,000
Fair Value, Measurements, Nonrecurring | Total Carrying Amount | Silversea Cruises (1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Silversea Goodwill				508,578,000
Fair Value, Measurements, Nonrecurring | Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Indefinite-life intangible asset				318,700,000
Long-lived assets	0		0	577,193,000
Right-of-use assets				67,265,000
Equity method investments				0
Total	0		0	1,471,736,000
Fair Value, Measurements, Nonrecurring | Total Fair Value | Silversea Cruises (1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Silversea Goodwill				508,578,000
Fair Value, Measurements, Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Indefinite-life intangible asset				318,700,000
Long-lived assets	0		0	577,193,000
Right-of-use assets				67,265,000
Equity method investments				0
Total	$ 0		$ 0	1,471,736,000
Fair Value, Measurements, Nonrecurring | Level 3 | Discount rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Indefinite-lived intangible assets, measurement input	13.25%		13.25%
Fair Value, Measurements, Nonrecurring | Level 3 | Royalty fee percentage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Indefinite-lived intangible assets, measurement input	3.00%		3.00%
Fair Value, Measurements, Nonrecurring | Level 3 | Silversea Cruises (1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Silversea Goodwill				$ 508,578,000
Fair Value, Measurements, Nonrecurring | Level 3 | Silversea Cruises (1) | Weighted average cost of capital
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill, measurement input	12.75%		12.75%