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Capital Stock - Additional Information (Detail) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May. 15, 2015 | Apr. 28, 2015 | Jan. 05, 2015 | Jan. 30, 2015 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 19, 2012 | Jun. 30, 2015 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | May. 11, 2015 | May. 10, 2015 | Jan. 30, 2014 | Dec. 31, 2013
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  |  |  |  | 3,500,000,000 | 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 |  |  | 10,000,000 | 5,000,000 |  |
Common stock, par value |  |  |  |  |  |  |  | $ 0.00001 | $ 0.00001 |  | $ 0.00001 | $ 0.00001 | $ 0.00001 |  |
Preferred stock, par value |  |  |  |  |  |  |  | 0.00001 | 0.00001 |  |  | $ 0.00001 | $ 0.00001 |  |
Conversion of shares |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
Warrants to purchase in aggregate, shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 61,400,000 |
Convertible preferred stock conversion price |  |  |  |  |  |  |  |  | 1.10 |  |  |  |  |  |
Preferred stock liquidation preference per share |  |  |  |  |  |  |  | $ 10.00 | $ 10.00 |  |  |  |  |  |
Preferred deemed dividend |  |  |  |  |  | $ 9,455,000 |  |  |  | $ 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% | 50.00% | 50.00% |  |  |  |  |  |
Registration right period |  |  |  |  |  |  |  |  | 180 days |  |  |  |  |  |
Preferred stock dividend rate |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |
Escrow deposit |  |  | $ 598,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Amount of restricted stock grants |  | $ 269,234 |  |  |  |  |  |  | $ 3,555,556 |  | $ 600,000 |  |  |  |
Amount of additional restricted stock grants issued |  | $ 700,000 |  |  |  |  |  |  |  |  | 700,000 |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Unamortized value of unvested restricted share grant |  |  |  |  |  |  |  | $ 10,420,000 | $ 10,420,000 |  | $ 1,200,000 |  |  |  |
Share price | $ 2.76 | $ 2.60 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity-based compensation |  |  |  |  |  |  |  |  | $ 779,000 | $ 373,000 |  |  |  |  |
Per share of unvested shares of common stock |  |  |  |  |  |  |  |  | $ 0.0001 |  |  |  |  |  |
Vested number of shares |  |  |  |  | 190,070 |  |  |  |  |  |  |  |  |  |
Vested number of shares, outstanding |  |  |  |  | 113,146 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |
Vested number of shares, issued |  | 76,924 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding |  |  |  |  |  |  |  | 206,168,035 | 206,168,035 |  | 202,343,245 |  |  |  |
Warrants to purchase common stock, outstanding |  |  |  |  |  |  |  | 61,400,000 | 61,400,000 |  | 61,400,000 |  |  |  |
Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of restricted stock grants | $ 1,777,778 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chief Operating Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of restricted stock grants | 1,777,778 |  |  |  |  |  |  |  |  |  |  |  |  |  |
EXEC Grants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of restricted stock grants | $ 9,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price | $ 2.76 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock fair value |  |  |  |  |  |  |  |  | $ 9,300,000 |  |  |  |  |  |
Restricted stock price per share |  |  |  |  |  |  |  |  | $ 2.61 |  |  |  |  |  |
Restricted shares subject to repurchase [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unvested shares |  |  |  |  |  |  |  | 4,197,396 | 4,197,396 |  | 1,343,764 |  |  |  | 1,456,987
Convertible Series A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value |  |  |  |  |  |  |  | $ 0.00001 | $ 0.00001 |  | $ 0.00001 |  |  |  |
Preferred stock, shares issued |  |  |  |  |  |  |  | 1,000,000 | 1,000,000 |  | 1,000,000 |  |  | 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. |  |  |  |  |  |
Preferred stock, shares outstanding |  |  |  |  |  |  |  | 1,000,000 | 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 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 |  |  |  |  |  |  |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value |  |  |  |  |  |  |  | $ 1.75 | $ 1.75 |  |  |  |  |  |
Preferred stock, par value |  |  | $ 0.00001 |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued |  |  | 600,000 |  |  |  |  | 600,000 | 600,000 |  | 0 |  |  |  |
Preferred stock liquidation preference per share |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividend rate |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |
Number of trading periods |  |  |  |  |  |  |  |  | 20 days |  |  |  |  |  |
Aggregate fair value |  |  | $ 66,200,000 |  |  |  |  | $ 141,400,000 | $ 141,400,000 |  |  |  |  |  |
Changes in Fair Value |  |  |  |  |  |  |  | $ 75,200,000 |  |  |  |  |  |  |
Preferred stock, shares outstanding |  |  |  |  |  |  |  | 600,000 | 600,000 |  | 0 |  |  |  |
Series B Preferred Stock [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value |  |  |  |  |  |  |  | $ 2.25 | $ 2.25 |  |  |  |  |  |
Series B Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price | $ 2.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  |  |  |  |  |  |  | 600,000 | 600,000 |  | 0 |  |  |  |
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 Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares. + References No definition available. + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: 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.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of warrants or rights outstanding. + References Reference 1: 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.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Face amount or stated value per share of common stock. + 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 Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + 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 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 3: 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 4: 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 Number of shares issued for each share of convertible preferred stock that is converted. + 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 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 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 For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + 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 maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + 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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