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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Useful Lives of Property and Equipment Used in Computation of Depreciation | Depreciation of property and equipment is computed utilizing the following useful lives:
| Years
Ships | generally 30
Ship improvements | 3-20
Buildings and improvements | 10-40
Computer hardware and software | 3-10
Transportation equipment and other | 3-30
Leasehold improvements | Shorter of remaining lease term or useful life 3-30
Passenger Ticket Revenues Attributed to Geographic Areas Based on Where Reservation Originates | Information by geographic area is shown in the table below. Passenger ticket revenues are attributed to geographic areas based on where the reservation originates.
| 2017 |  | 2016 |  | 2015
Passenger ticket revenues: |  |  |  |  |
United States | 59% |  | 55% |  | 55%
All other countries | 41% |  | 45% |  | 45%

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