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Basis of Presentation and Significant Accounting Policies - Summary of Dry-Docking Activity (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Balance at January 1,	$ 2,021,125
Cost incurred for dry docking	7,493	19,638	12,727
Balance at December 31,	1,949,640	2,021,125
Dry-Docking Activity [Member]
Property, Plant and Equipment [Line Items]
Balance at January 1,	34,449	24,393	20,477
Cost incurred for dry docking	7,493	19,638	12,727
Sale of vessel			(1,477)
Dry-dock amortization	(13,121)	(9,582)	(7,334)
Balance at December 31,	$ 28,821	$ 34,449	$ 24,393

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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