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Fresh Start Financial Statement Reporting - Fresh Start Reorganized Condensed Consolidated Balance Sheet (Parenthetical) (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | May. 01, 2013 | Apr. 30, 2013
--- | --- | --- | --- | ---
Fresh-Start Adjustment [Line Items] |  |  |  |
Common stock, shares issued |  |  |  | 45,000,000
Number of warrants issued |  |  |  | 5,047,138
Pre-tax gain on extinguishment of obligations |  |  |  | $ 1,521,435
Reorganization Item Adjustments [Member] |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Cash |  |  |  | (101,900)
Successor [Member] |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Cash |  |  |  | $ 152,951
Common stock, shares issued | 45,044,222 | 45,005,932 | 45,000,000 |

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