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- Definition

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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- Definition

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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- Definition

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	3 Months Ended		6 Months Ended
Revenues - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Capitalized Contract Cost [Line Items]
Passenger ticket revenues	$ 2,337,605	$ 2,195,274	$ 4,365,361	$ 4,203,834
Contract liability	2,000,000		2,000,000		$ 1,400,000
Contract asset	58,900		58,900		60,100
Travel Agent Sales Commissions
Capitalized Contract Cost [Line Items]
Prepaid travel agent commissions	148,200		$ 148,200		$ 64,600
Minimum
Capitalized Contract Cost [Line Items]
Length of cruise			2 days
Maximum
Capitalized Contract Cost [Line Items]
Length of cruise			23 days
Port Costs
Capitalized Contract Cost [Line Items]
Passenger ticket revenues	$ 151,400	$ 143,400	$ 288,100	$ 277,900