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Changes in Carrying Amount of Deferred Debt Issuance Costs (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Balance at beginning of period	$ 17,125	$ 16,073
Debt issuance costs and performance guarantees		4,944
Amortization of interest expense	(3,364)	(3,892)
Balance at end of period	$ 13,761	$ 17,125

For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

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