Amounts Related to Shipboard Retirement Plan (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension expense:
Service cost	$ 1,498	$ 1,367	$ 1,072
Interest cost	603	604	531
Amortization of prior service cost	378	378	378
Amortization of actuarial loss	90	13
Total pension expense	2,569	2,362	1,981
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	16,221	13,329	9,478
Service cost	1,498	1,367	1,072
Interest cost	603	604	531
Actuarial gain (loss)	(2,070)	1,721	2,993
Direct benefit payments	(682)	(800)	(745)
Projected benefit obligation at end of year	15,570	16,221	13,329
Amounts recognized in the consolidated balance sheets:
Projected benefit obligation	15,570	16,221	13,329
Amounts recognized in accumulated other comprehensive income (loss):
Prior service cost	(6,049)	(6,427)	(6,805)
Accumulated actuarial loss	(1,160)	(3,320)	(1,612)
Accumulated other comprehensive income (loss)	$ (7,209)	$ (9,747)	$ (8,417)