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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
Mar. 19, 2012
Jun. 30, 2013
Dec. 31, 2012
Mar. 19, 2012
WMMRC [Member]
Mar. 19, 2012
Runoff Notes [Member]
Mar. 19, 2012
Reorganization Adjustments [Member]
Mar. 19, 2012
Successor [Member]
Mar. 19, 2012
Fair Value Adjustments [Member]
Mar. 19, 2012
Predecessor [Member]
Mar. 19, 2012
Predecessor [Member]
Fresh-Start Adjustment [Line Items]                    
Common stock, par value   $ 0.00001 $ 0.00001     $ 0.00001 $ 0.00001 $ 1 $ 0.00001 $ 0.00001
Common stock, shares outstanding   201,156,078 201,156,078     200,000,000 200,000,000 1,000 1,000 1,000
Common stock, shares issued   201,156,078 201,156,078     200,000,000 200,000,000 1,000 1,000 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%