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The Company and its Subsidiaries - Additional Information (Detail) (USD $)
 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2014
Operations
Dec. 31, 2013
Dec. 31, 2012
Mar. 19, 2012
Sep. 25, 2008
Mar. 31, 2014
Two Thousand And Twelve Restricted Stock Unit Plan [Member]
Feb. 10, 2014
Two Thousand And Twelve Restricted Stock Unit Plan [Member]
Aug. 13, 2013
Two Thousand And Twelve Restricted Stock Unit Plan [Member]
Oct. 18, 2012
Two Thousand And Twelve Restricted Stock Unit Plan [Member]
Mar. 31, 2014
New WMI Shareholders [Member]
Mar. 31, 2014
Escrow Deposit [Member]
Mar. 31, 2014
13% Senior First Lien Notes [Member]
Mar. 31, 2014
13% Senior Second Lien Notes [Member]
Mar. 31, 2014
WMI Holdings Corp. [Member]
Mar. 31, 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 202,092,351 201,842,351         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 202,092,351 201,842,351                          
Preferred stock, shares outstanding 1,000,000 0                          
Number of primary mortgage insurers                             7