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Amount, before accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Revenues (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Revenues (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Capitalized Contract Cost [Line Items]
Total revenues	$ 9,493,849	$ 8,777,845	$ 8,496,401
Contract liabilities	1,900,000	1,400,000
Contract assets	57,800	60,100
Commissions, transportation and other
Capitalized Contract Cost [Line Items]
Capitalized contract costs	$ 153,500	64,600
Minimum
Capitalized Contract Cost [Line Items]
Duration of cruises	2 days
Maximum
Capitalized Contract Cost [Line Items]
Duration of cruises	25 days
Port Costs
Capitalized Contract Cost [Line Items]
Total revenues	$ 611,400	$ 569,500	$ 570,300