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Financial Instruments - Fair Value Amounts of Derivative Instruments and their Effect on Statement of Operations (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Dec. 31, 2012
Subordinated Note [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Subordinated Note due 2014	$ 100,000	$ 100,000
Caps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Maturity date of interest rate cap contract	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2012

Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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