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Debtor in Possession Financial Information - Summary of Liabilities Subject to Compromise in Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Reorganizations [Abstract]
Debt obligations and accrued interest payable	$ 1,690,312	$ 1,690,312
Accounts payable	14,329	14,592
Consolidated liabilities subject to compromise	1,704,641	1,704,904
Payable to non-debtor subsidiaries		35
Debtor's Liabilities subject to compromise	$ 1,704,641	$ 1,704,939

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