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The Company and its Subsidiaries - Additional Information (Detail) (USD $) | 6 Months Ended |  |  |  |  | 6 Months Ended |  |  |  |  |  | 6 Months Ended
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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

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