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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. 31, 2016 | Mar. 31, 2015 | Mar. 19, 2012 | Dec. 31, 2015 | May. 11, 2015 | May. 10, 2015 | Dec. 31, 2014 | Jan. 30, 2014
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 |  |  |  |  | $ 9,500,000 |  |  |  |  |  |  |  |
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 |  |  | 600,000 |  |  |  |  |
Escrow deposit |  |  | $ 598,500,000 |  |  |  |  |  |  |  |  |  |
Derivative liability - embedded conversion feature |  |  |  |  | $ 64,973,000 |  |  | $ 120,848,000 | [1] |  |  |  |
Changes in fair value |  |  |  |  | $ 55,875,000 | $ 7,260,000 |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 3 years |  |  |  |  |  |  |  |
Unamortized value of unvested restricted share grant |  |  |  |  | $ 8,958,000 |  |  | 10,000,000 |  |  |  |  |
Equity-based compensation |  |  |  |  | $ 164,000 | $ 384,000 |  |  |  |  |  |  |
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 |  |  | 206,168,035 |  |  |  |  |
Common stock, shares outstanding |  |  |  |  | 206,168,035 |  |  | 206,168,035 |  |  |  |  |
Preferred stock, shares outstanding |  |  |  |  | 600,000 |  |  | 600,000 |  |  |  |  |
Warrants to purchase common stock, Issued |  |  |  |  | 61,400,000 |  |  | 61,400,000 |  |  |  |  |
Warrants to purchase common stock, outstanding |  |  |  |  | 61,400,000 |  |  | 61,400,000 |  |  |  |  |
EXEC Grants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share price | $ 2.76 |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock fair value |  |  |  |  | $ 8,300,000 |  |  |  |  |  |  |  |
Restricted stock price per share |  |  |  |  | $ 2.34 |  |  |  |  |  |  |  |
Restricted stock award [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of restricted stock grants |  | $ 700,000 |  |  |  |  |  |  |  |  |  |  |
Share price | $ 2.76 | $ 2.60 |  |  |  |  |  |  |  |  |  |  |
Unvested shares |  |  |  |  | 6,168,035 |  |  | 6,168,035 |  |  |  | 2,343,245 |
Number of Restricted Stock Awards Outstanding, Restricted stock awards granted | 3,555,556 | 269,234 |  |  | 0 |  |  | 3,824,790 |  |  |  |  |
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 |  |  |  |  | 3,826,826 |  |  | 4,197,396 |  |  |  | 1,343,764 |
Number of Restricted Stock Awards Outstanding, Restricted stock awards granted |  |  |  |  |  |  |  | 3,824,790 |  |  |  |  |
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 |  |  |  |  | 1,000,000
Purchase price of convertible preferred stock maximum limit |  |  |  |  |  |  |  |  | [1] |  |  |  | $ 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 |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, Shares |  |  |  |  |  |  |  | 600,000 |  |  |  |  |
Preferred stock liquidation preference per share |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued |  |  | 600,000 |  | 600,000 |  |  | 600,000 |  |  |  |  |
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 |  | $ 65,000,000 | $ 59,000,000 |  | $ 120,800,000 |  |  |  |  |
Changes in fair value |  |  |  |  | $ 55,800,000 | $ 7,200,000 |  | $ 54,600,000 |  |  |  |  |
Share price | $ 2.25 |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  |  |  |  | 600,000 |  |  | 600,000 |  |  |  |  |
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
[1] | Balances derived from audited financial statements as of December 31, 2015.

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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 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 Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + 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 210.5-02.28) -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 29 -Article 5 + Details
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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + 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 210.5-02.28) -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 29 -Article 5 + Details
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- Definition Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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 The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + 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 210.5-02.27(b)) -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 28 -Subparagraph b -Article 5 + Details
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