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Fresh Start Financial Statement Reporting - Schedule of Reconciliation of Enterprise Value to Reorganization Value, and Determination of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Apr. 30, 2013
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Reorganizations [Abstract] |  |
Enterprise value | $ 185,000 | $ 185,000
Add: Fair value of liabilities |  | 28,393,020
Add: Fair value of noncontrolling interest |  | 275,415
Reorganization value allocated to assets |  | 28,853,435
Less: Fair value of identified tangible and intangible assets |  | 28,338,924
Reorganization value in excess of fair value of assets (goodwill) |  | $ 514,511

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