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Capital Stock - Additional Information (Detail) (USD $)
 1 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended
Jan. 30, 2014
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Mar. 31, 2014
Mar. 19, 2012
Jun. 30, 2014
Warrant One [Member]
Jun. 30, 2014
Warrant Two [Member]
Jun. 30, 2014
Restricted shares subject to repurchase [Member]
Dec. 31, 2013
Restricted shares subject to repurchase [Member]
Dec. 31, 2012
Restricted shares subject to repurchase [Member]
Jun. 30, 2014
Series A Convertible Preferred Stock [Member]
Jan. 30, 2014
Convertible Preferred Stock [Member]
Jun. 30, 2014
Convertible Preferred Stock [Member]
Jan. 30, 2014
Convertible Preferred Stock [Member]
Maximum [Member]
Mar. 19, 2012
Reorganization Adjustments [Member]
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   202,343,245   201,842,351                       200,000,000
Number convertible preferred stock issued   1,000,000   0               1,000,000        
Purchase price of convertible preferred stock maximum limit   $ 0   $ 0               $ 11,100,000        
Warrants to purchase in aggregate, shares   61,400,000   0                        
Warrants to purchase common stock             30,700,000 30,700,000                
Warrants to purchase common stock, exercise price             1.32 1.43                
Preferred stock liquidation preference                       The Convertible Preferred Stock has rights substantially similar to those associated with WMIHC’s common stock, with the exception of a liquidation preference, conversion rights and customary anti-dilution protections. The Convertible Preferred Stock has a liquidation preference equal to the greater of (i) $10.00 per one million shares of Convertible Preferred Stock plus declared but unpaid dividends on such shares and (ii) the amount that the holder would be entitled to in a relevant transaction had the Convertible Preferred Stock been converted to common stock of WMIHC.        
Convertible preferred stock conversion price   $ 1.10                            
Preferred stock liquidation preference per share   $ 10.00                            
Convertible Preferred Stock, shares   1,000,000                            
Preferred deemed dividend   9,455,000                            
Warrants expiration period   5 years                            
Investment holding of preference shareholders 42.50% 50.00%       50.00%                 50.00%  
Percentage of rights vest with preferred shareholders to future offering                             50.00%  
Expiration of right to participating into future offering                         Jan. 30, 2017      
Preferred stock participation value                             1,000,000,000  
Preferred stock participation right                         Additionally, until January 30, 2017, the Holders will have the right to purchase up to 50% of any future equity rights offerings or other equity issuance by WMIHC on the same terms as the equity issued to other investors in such transactions, in an aggregate amount of such offerings and issuances by WMIHC of up to $1.0 billion Additionally, until January 30, 2017, the Holders will have the right to purchase up to 50% of any future equity rights offerings or other equity issuance by WMIHC on the same terms as the equity issued to other investors in such transactions, in an aggregate amount of such offerings and issuances by WMIHC of up to $1.0 billion    
Registration right period 180 days                              
Amount of restricted share grants   600,000   700,000                        
Amount of additional restricted share grants issued   700,000                            
Award vesting period   3 years                            
Unamortized value of unvested restricted share grant   1,664,000   700,000 1,664,000                      
Stock-based compensation   $ 373,000 $ 92,000 $ 401,000                        
Unvested shares                 1,343,764 1,456,987 1,156,078          
Per share of unvested shares of common stock   $ 0.0001                            
Common stock, shares outstanding   202,343,245   201,842,351                        
Preferred stock, shares outstanding   1,000,000   0                        
Warrants to purchase common stock, outstanding   61,400,000   0