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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	Jun. 30, 2013	Apr. 30, 2013
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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