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Summary of Significant Accounting Policies - Summarized 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 the end of the year	$ 7,321,058	$ 7,890,761
Dry docking activity [Member]
Property, Plant and Equipment [Line Items]
Balance at the beginning of the year	128,987	143,103	172,053
Costs incurred for drydocking	35,336	54,296	57,156
Dry-dock amortization	(57,082)	(67,180)	(86,106)
Write down / sale of vessels	(6,313)	(1,232)
Balance at the end of the year	$ 100,928	$ 128,987	$ 143,103

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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