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Basis of Presentation and Significant Accounting Policies - Summary of Reorganization Items in Consolidated Statements of Total Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Reorganization Items [Line Items]
U.S. Trustee fees	$ 50	$ 44
Professional fees	7,165	35,778
Office lease settlement		14,007
Debt valuation adjustments		32
Total reorganization items	$ 7,215	$ 49,861

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Settlement agreement allowing a general unsecured claim to the lessor.

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Amount of reorganization items related to legal and advisory professional fees related to entities in bankruptcy.

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Amount of write-off of deferred financing costs and debt discounts related to prepetition debt obligations.

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