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Capital Stock - Additional Information (Detail) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May. 15, 2015 | Apr. 28, 2015 | Jan. 05, 2015 | Jan. 30, 2015 | Mar. 19, 2012 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | May. 11, 2015 | May. 10, 2015 | Jan. 30, 2014 | Dec. 31, 2012
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  |  | 3,500,000,000 | 3,500,000,000 |  | 3,500,000,000 | 500,000,000 |  |
Preferred stock, shares authorized |  |  |  |  |  | 10,000,000 |  |  | 10,000,000 | 5,000,000 |  |
Common stock, par value |  |  |  |  |  | $ 0.00001 | $ 0.00001 |  | $ 0.00001 | $ 0.00001 |  |
Preferred stock, par value |  |  |  |  |  | $ 0.00001 |  |  | $ 0.00001 | $ 0.00001 |  |
Conversion of shares |  |  |  |  |  |  |  |  | 1 |  |  |
Warrants to purchase in aggregate, shares |  |  |  |  |  |  |  |  |  |  | 61,400,000 |
Preferred deemed dividend |  |  |  |  |  |  | $ 9,455,000 |  |  |  |  |
Warrants expiration period |  |  |  |  |  | 5 years |  |  |  |  |  |
Maximum percent of the voting shares of the emerging entity immediately prior to the confirmation of reorganization |  |  |  | 42.50% |  | 50.00% |  |  |  |  |  |
Registration right period |  |  |  |  |  | 180 days |  |  |  |  |  |
Preferred stock, shares issued |  |  |  |  |  | 600,000 | 0 |  |  |  |  |
Escrow deposit |  |  | $ 598,500,000 |  |  |  |  |  |  |  |  |
Derivative liability - embedded conversion feature |  |  |  |  |  | $ 120,848,000 |  |  |  |  |  |
Changes in fair value |  |  |  |  |  | $ (54,621,000) |  |  |  |  |  |
Award vesting period |  |  |  |  |  | 3 years |  |  |  |  |  |
Unamortized value of unvested restricted share grant |  |  |  |  |  | $ 10,011,000 | $ 1,200,000 | $ 700,000 |  |  |  |
Equity-based compensation |  |  |  |  |  | $ 1,129,000 | $ 807,000 | $ 401,000 |  |  |  |
Per share of unvested shares of common stock |  |  |  |  |  | $ 0.0001 |  |  |  |  |  |
Vested number of shares |  |  |  |  |  |  | 190,070 |  |  |  |  |
Vested number of shares, outstanding |  |  |  |  |  |  | 113,146 |  |  |  |  |
Vested number of shares, issued |  | 76,924 |  |  |  |  |  |  |  |  |  |
Expected increase in additional paid in capital due to early vesting of equity shares |  |  |  |  |  | $ 382,000 |  |  |  |  |  |
Expected increase in share based compensation due to early vesting of equity shares |  |  |  |  |  | $ 382,000 |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  | 206,168,035 | 202,343,245 | 201,842,351 |  |  |  |
Common stock, shares outstanding |  |  |  |  |  | 206,168,035 | 202,343,245 | 201,842,351 |  |  |  |
Preferred stock, shares outstanding |  |  |  |  |  | 600,000 | 0 |  |  |  |  |
Warrants to purchase common stock, Issued |  |  |  |  |  | 61,400,000 | 61,400,000 | 0 |  |  |  |
Warrants to purchase common stock, outstanding |  |  |  |  |  | 61,400,000 | 61,400,000 | 0 |  |  |  |
EXEC Grants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share price | $ 2.76 |  |  |  |  |  |  |  |  |  |  |
Restricted stock fair value |  |  |  |  |  | $ 9,200,000 |  |  |  |  |  |
Restricted stock price per share |  |  |  |  |  | $ 2.59 |  |  |  |  |  |
Restricted stock award [Member] |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount of restricted stock grants |  |  |  |  |  | $ 700,000 | $ 1,300,000 | $ 700,000 |  |  |  |
Share price | $ 2.76 | $ 2.60 |  |  |  |  |  |  |  |  |  |
Unvested shares |  |  |  |  |  | 6,168,035 | 2,343,245 | 1,842,351 |  |  |  | 1,156,078
Number of Restricted Stock Awards Outstanding, Restricted stock awards granted | 3,555,556 | 269,234 |  |  |  | 3,824,790 | 500,894 | 686,273 |  |  |  |
Restricted stock award [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of Restricted Stock Awards Outstanding, Restricted stock awards granted | 1,777,778 |  |  |  |  |  |  |  |  |  |  |
Restricted stock award [Member] | Chief Operating Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of Restricted Stock Awards Outstanding, Restricted stock awards granted | 1,777,778 |  |  |  |  |  |  |  |  |  |  |
Restricted stock award [Member] | EXEC Grants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount of restricted stock grants | $ 9,800,000 |  |  |  |  |  |  |  |  |  |  |
Restricted shares subject to repurchase [Member] |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unvested shares |  |  |  |  |  | 4,197,396 | 1,343,764 | 1,456,987 |  |  |  | 1,156,078
Number of Restricted Stock Awards Outstanding, Restricted stock awards granted |  |  |  |  |  | 3,824,790 | 500,894 | 686,273 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock liquidation preference per share |  |  |  |  |  |  | $ 10.00 |  |  |  |  |
Convertible Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value |  |  |  |  |  | $ 0.00001 | $ 0.00001 |  |  |  |  |
Preferred stock, shares issued |  |  |  |  |  | 1,000,000 | 1,000,000 | 0 |  |  | 1,000,000 |
Purchase price of convertible preferred stock maximum limit |  |  |  |  |  |  |  |  |  |  | $ 11,100,000 |
Preferred stock liquidation preference |  |  |  |  |  | The Series A Preferred Stock has rights substantially similar to those associated with WMIH’s common stock, with the exception of a liquidation preference, conversion rights and customary anti-dilution protections. The Series A Preferred Stock has a liquidation preference equal to the greater of (i) $10.00 per one million shares of Series A 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 Series A Preferred Stock been converted to common stock of WMIH. |  |  |  |  |  |
Convertible preferred stock conversion price |  |  |  |  |  |  | $ 1.10 |  |  |  |  |
Preferred stock, shares outstanding |  |  |  |  |  | 1,000,000 | 1,000,000 | 0 |  |  |  |
Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Expiration of right to participating into future offering |  |  |  | Jan. 30, 2017 |  |  |  |  |  |  |  |
Preferred stock participation right |  |  |  |  |  | Additionally, until January 30, 2017, the Series A Holders will have the right to purchase up to 50% of any future equity rights offerings or other equity issuance by WMIH on the same terms as the equity issued to other investors in such transactions, in an aggregate amount of such offerings and issuances by WMIH of up to $1.0 billion |  |  |  |  |  |
Convertible Preferred Stock [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum percent of the voting common shares of the emerging entity immediately prior to the confirmation of reorganization |  |  |  | 50.00% |  |  |  |  |  |  |  |
Percentage of rights vest with preferred shareholders to future offering |  |  |  | 50.00% |  |  |  |  |  |  |  |
Preferred stock participation value |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |
Redeemable Convertible Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value |  |  | $ 0.00001 |  |  |  |  |  |  |  |  |
Issuance of common stock, Shares |  |  |  |  |  | 600,000 |  |  |  |  |  |
Preferred stock liquidation preference per share |  |  | $ 1,000 |  |  |  |  |  |  |  |  |
Preferred stock, shares issued |  |  | 600,000 |  |  | 600,000 | 0 | 0 |  |  |  |
Preferred stock dividend rate calculated on interest rate |  |  | 3.00% |  |  |  |  |  |  |  |  |
Number of trading periods |  |  |  |  |  | 20 days |  |  |  |  |  |
Conversion floor price of common stock |  |  |  |  |  | $ 1.75 |  |  |  |  |  |
Derivative liability - embedded conversion feature |  |  | $ 66,200,000 |  |  | $ 120,800,000 |  |  |  |  |  |
Changes in fair value |  |  |  |  |  | $ 54,600,000 |  |  |  |  |  |
Share price | $ 2.25 |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  |  |  |  |  | 600,000 | 0 | 0 |  |  |  |
Redeemable Convertible Series B Preferred Stock [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock liquidation preference per share |  |  | $ 1,000 |  |  |  |  |  |  |  |  |
Redeemable Convertible Series B Preferred Stock [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion ceiling price of common stock |  |  |  |  |  | $ 2.25 |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, Shares |  |  |  |  | 200,000,000 |  |  |  |  |  |  |
Warrant One [Member] |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase common stock |  |  |  |  |  |  |  |  |  |  | 30,700,000 |
Warrants to purchase common stock, exercise price |  |  |  |  |  |  |  |  |  |  | $ 1.32 |
Warrant Two [Member] |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase common stock |  |  |  |  |  |  |  |  |  |  | 30,700,000 |
Warrants to purchase common stock, exercise price |  |  |  |  |  |  |  |  |  |  | $ 1.43 |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 + Details
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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- Definition Describe the contractual rights of preferred stockholders to receive dividends or returns from the entity's profits, cash flows, or returns on investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Participation Rights -URI http://asc.fasb.org/extlink&oid=6519907 + Details
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- Definition The redemption terms of preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity. The redemption features of this capital stock are solely within the control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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