Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Ships	$ 23,978,822	$ 22,102,025
Ship improvements	2,359,639	2,019,294
Ships under construction	354,425	734,998
Land, buildings and improvements, including leasehold improvements and port facilities	341,605	337,109
Computer hardware and software, transportation equipment and other	1,108,301	1,025,264
Total property and equipment	28,142,792	26,218,690
Less-accumulated depreciation and amortization	(7,981,365)	(7,440,912)
Property and equipment, net	$ 20,161,427	$ 18,777,778