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Fresh Start Accounting - Assets and Liabilities at Fair Value (Parenthetical) (Detail) (USD $) | 6 Months Ended |  |  |  | 1 Months Ended | 3 Months Ended |
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Mar. 19, 2012 | Sep. 30, 2013 | Dec. 31, 2012 | Mar. 19, 2012 WMMRC [Member] | Mar. 19, 2012 Runoff Notes [Member] | Mar. 19, 2012 Successor [Member] | Mar. 19, 2012 Predecessor [Member] | Mar. 19, 2012 Predecessor [Member] | Mar. 19, 2012 Reorganization Adjustments [Member] | Mar. 19, 2012 Fair Value Adjustments [Member]
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, par value |  | $ 0.00001 | $ 0.00001 |  |  | $ 0.00001 | $ 0.00001 | $ 0.00001 | $ 0.00001 | $ 1
Common stock, shares outstanding |  | 201,842,351 | 201,156,078 |  |  | 200,000,000 | 1,000 | 1,000 | 200,000,000 | 1,000
Common stock, shares issued |  | 201,842,351 | 201,156,078 |  |  | 200,000,000 | 1,000 | 1,000 | 200,000,000 | 1,000
Common stock, shares authorized |  | 500,000,000 | 500,000,000 |  |  | 500,000,000 |  |  | 500,000,000 |
Cash contributed to the Company by creditors | $ 75,000,000 |  |  |  |  |  |  | $ 75,000,000 |  |
Court's valuation of WMMRC |  |  |  | 140,000,000 |  |  |  |  |  |
Outstanding amount of notes |  |  |  |  | 130,000,000 |  |  |  |  |
Net assets or equity Value |  |  |  | 171,600,000 |  |  |  |  |  |
Loss contract fair market value reserve | 63,100,000 | 51,230,000 | 52,217,000 |  |  | 63,100,000 |  |  |  |
Increase in equity value |  |  |  |  |  |  | 194,700,000 |  |  |
Reduction in WMMRC's FMV | 8,400,000 |  |  | 8,400,000 |  |  |  |  |  |
Value related to NOLs | $ 70,000,000 |  |  |  |  |  |  |  |  |
Valuation allowance | 100.00% | 100.00% |  |  |  |  |  |  |  |

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