Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Ships	$ 22,102,025	$ 21,620,336
Ship improvements	2,019,294	1,904,524
Ships under construction	734,998	561,779
Land, buildings and improvements, including leasehold improvements and port facilities	337,109	303,394
Computer hardware and software, transportation equipment and other	1,025,264	889,579
Total property and equipment	26,218,690	25,279,612
Less-accumulated depreciation and amortization	(7,440,912)	(7,085,985)
Property and equipment, net	$ 18,777,778	$ 18,193,627