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The Company and its Subsidiaries - Additional Information (Detail) (USD $)
 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
Operations
Dec. 31, 2013
Dec. 31, 2012
Mar. 19, 2012
Sep. 25, 2008
Jun. 30, 2014
2012 Restricted Stock Unit Plan [Member]
Jun. 04, 2014
2012 Restricted Stock Unit Plan [Member]
Feb. 10, 2014
2012 Restricted Stock Unit Plan [Member]
Aug. 13, 2013
2012 Restricted Stock Unit Plan [Member]
Oct. 18, 2012
2012 Restricted Stock Unit Plan [Member]
Jun. 30, 2014
New WMI Shareholders [Member]
Jun. 30, 2014
Escrow Deposit [Member]
Jun. 30, 2014
13% Senior First Lien Notes [Member]
Jun. 30, 2014
13% Senior Second Lien Notes [Member]
Jun. 30, 2014
WMI Holdings Corp. [Member]
Jun. 30, 2014
WMMRC [Member]
Insurers
Related Party Transaction [Line Items]                                
Number of operations 1                              
Assets sold of WMB in exchange for payment         $ 1,880,000,000                      
Debtors field plan Dec. 12, 2011                              
Plan Effective Date Mar. 19, 2012                              
Claims distributed to parties-in-interest 6,500,000,000                              
Cash received from creditors 75,000,000                              
Senior credit facility 125,000,000                              
Senior credit facility for working capital 25,000,000                              
Senior credit facility for acquisitions and originations 100,000,000                              
Issued aggregate principal amount                         110,000,000 20,000,000    
Debt amount percentage                         13.00% 13.00%    
Common stock, shares issued 202,343,245 201,842,351         250,894 250,000 686,273 1,156,078 194,670,501 5,329,499     200,000,000  
Abandoned stock     8,370,000,000 8,370,000,000                        
Available and utilizable NOL   $ 5,960,000,000                            
Common stock, shares authorized 500,000,000 500,000,000                            
Preferred stock, shares authorized 5,000,000 5,000,000                            
Common stock, par value $ 0.00001 $ 0.00001                            
Preferred stock, par value $ 0.00001 $ 0.00001                            
Common stock shares issued on effective date           200,000,000                    
Common stock shares issued to new shareholders 194,670,501                              
Disputed equity escrow shares 5,329,499                              
Shares remained in disputed equity escrow 2,922,037                              
Preferred stock, shares issued 1,000,000 0                            
Common stock, shares outstanding 202,343,245 201,842,351                            
Preferred stock, shares outstanding 1,000,000 0                            
Number of primary mortgage insurers                               7