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Capital Stock - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 19, 2013
Mar. 31, 2013
Y
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Capital Stock Distribution [Line Items]          
Common stock, shares authorized   500,000,000   500,000,000  
Preferred stock, shares authorized   5,000,000   5,000,000  
Preferred stock, par value   $ 0.00001   $ 0.00001  
Common stock, par value   $ 0.00001   $ 0.00001  
Common stock, shares issued   201,156,078   201,156,078  
Amount of restricted share grants   $ 0   $ 550,000  
Unamortized value of unvested restricted share grant   361,000   407,000  
Amortized period for unvested restricted share   2.0      
Stock-based compensation   $ 46,000 $ 0    
Award vesting period   3 years      
Award vesting rights   1/3 per year      
Number of shares vested 385,364 385,364       
Unvested shares   770,714   1,156,078   
Per share of unvested shares of common stock   $ 0.0001      
Common stock, shares outstanding   201,156,078   201,156,078  
Preferred stock, shares issued   0   0  
Preferred stock, shares outstanding   0   0  
WMI Holdings Corp [Member]
          
Capital Stock Distribution [Line Items]          
Common stock, shares issued   200,000,000