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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
Mar. 31, 2013
Dec. 31, 2012
Mar. 19, 2012
Reorganization Adjustments [Member]
Mar. 19, 2012
Successor [Member]
Mar. 19, 2012
Predecessor [Member]
Mar. 19, 2012
Predecessor [Member]
Mar. 19, 2012
Fair Value Adjustments [Member]
Mar. 19, 2012
WMMRC [Member]
Mar. 19, 2012
Runoff Notes [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 authorized   500,000,000 500,000,000 500,000,000 500,000,000          
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 issued   201,156,078 201,156,078 200,000,000 200,000,000 1,000 1,000 1,000    
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
Common stock, par value   $ 0.00001 $ 0.00001 $ 0.00001 $ 0.00001 $ 0.00001 $ 0.00001 $ 1    
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    
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%