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Capital Stock and Derivative Instruments - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 01, 2017 | Jan. 05, 2015 | Mar. 19, 2012 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Feb. 12, 2018 | Jan. 05, 2018 | Dec. 07, 2017 | Dec. 31, 2016 | Jun. 01, 2016 | May 15, 2015 | May 11, 2015 | Jan. 30, 2014
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  | 500,000,000 | 3,500,000,000 |  | 3,500,000,000 |  |  |  |  |  |  |  | 3,500,000,000 |
Preferred stock, shares authorized |  |  | 5,000,000 | 10,000,000 |  |  |  |  |  |  |  |  |  | 10,000,000 |
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
Warrants expiration period |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase common stock, Issued |  |  |  | 61,400,000 |  | 61,400,000 |  | 61,400,000 |  |  |  |  |  |  |
Common stock, shares issued |  |  |  | 206,714,132 |  | 206,714,132 |  | 21,197,619 |  |  |  |  |  |  |
Registration right period |  |  |  | 180 days |  |  |  |  |  |  |  |  |  |  |
Escrow deposit |  | $ 598,500 |  | $ 576,200 |  | $ 578,900 |  |  |  |  |  |  |  |  |
Acquisition meaning |  |  |  | “Acquisition” means any acquisition by the Company (or any of its direct or indirect wholly-owned subsidiaries), in a single transaction or a series of transactions, whether by purchase, merger or otherwise, of all or substantially all of the assets of, or of 80% or more of the equity interests in, or a business line, unit or division of, any person. |  |  |  |  |  |  |  |  |  |  |
Fixed conversion price of common stock |  |  |  |  |  |  |  |  | $ 1.35 |  |  |  |  |  |
Fair market value of embedded conversion feature, reclassed to equity |  |  |  |  |  | 108,900 |  |  |  |  |  |  |  |  |
Changes in fair value |  |  |  |  | $ 18,029 |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |
Number of additional Restricted Stock Awards Outstanding, Restricted stock awards granted |  |  |  | 1,015,872 |  |  |  |  |  |  |  |  |  |  |
Unamortized value of unvested restricted share grant |  |  |  | $ 5,467 |  | $ 3,500 |  |  |  |  |  |  |  |  |
Equity-based compensation |  |  |  | $ 102 | 140 |  |  |  |  |  |  |  |  |  |
Per share of unvested shares of common stock |  |  |  | $ 0.00001 |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding |  |  |  | 206,714,132 |  | 206,714,132 |  |  |  |  |  |  |  |  |
Warrants to purchase common stock, outstanding |  |  |  | 61,400,000 |  | 61,400,000 |  |  |  |  |  |  |  |  |
Exec Grants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price |  |  |  | $ 2.25 |  |  |  |  |  |  |  |  | $ 2.76 |  |
Restricted stock fair value |  |  |  | $ 5,000 |  |  |  |  |  |  |  |  |  |  |
Restricted stock price per share |  |  |  | $ 1.42 |  |  |  |  |  |  |  |  |  |  |
Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional Restricted Stock Awards Outstanding, Restricted stock awards granted |  |  |  | 507,936 |  |  |  |  |  |  |  |  |  |  |
Restricted stock award [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of restricted stock grants | $ 400 |  |  |  |  |  |  |  |  |  |  | $ 400 |  |  |
Share price | $ 1.20 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unvested shares |  |  |  | 6,714,132 |  | 6,714,132 |  |  |  |  | 6,380,800 |  |  |  |
Number of Restricted Stock Awards Outstanding, Restricted stock awards granted | 333,332 |  |  | 0 |  | 333,332 |  |  |  |  |  |  |  |  |
Restricted stock award [Member] | Exec Grants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of restricted stock grants |  |  |  | $ 4,000 |  |  |  |  |  |  |  |  | $ 9,800 |  |
Restricted shares subject to repurchase [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unvested shares |  |  |  | 3,834,512 |  | 4,053,640 |  |  |  |  | 4,039,591 |  |  |  |
Number of Restricted Stock Awards Outstanding, Restricted stock awards granted |  |  |  |  |  | 333,332 |  |  |  |  |  |  |  |  |
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
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 deemed dividend |  |  |  | $ 9,500 |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  |  |  | 1,000,000 |  | 1,000,000 |  |  |  |  |  |  |  |  |
Redeemable Convertible Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock liquidation preference |  |  |  | If the Series B Preferred Stock is redeemed or determined likely to be redeemed, the Company would be required to record a charge to earnings of approximately $96.3 million to accrete the value of the Series B Preferred Stock to the $600.0 million redemption value. As of March 31, 2018, the Company has determined that recording for accretion to the Series B Preferred Stock’s redemption value is not required. |  |  |  |  |  |  |  |  |  |  |
Amendment effective term |  |  |  | 18 months |  |  |  |  |  |  |  |  |  |  |
Amendment Effective Date |  |  |  | Jan. 05, 2018 |  |  |  |  |  |  |  |  |  |  |
Minimum percentage of preferred stock beneficially to be owned by KKR funds and its affiliates for acquisition consent |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued |  | 600,000 |  | 600,000 |  | 600,000 |  |  |  |  |  |  |  |  |
Preferred stock dividend rate calculated on interest rate |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, redemption date |  |  |  | Oct. 05, 2019 |  |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses |  |  |  | $ 450,000 |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  |  |  | 600,000 |  | 600,000 |  |  |  |  | 600,000 |  |  |  |
Preferred stock, redemption amount |  |  |  | $ 600,000 |  |  |  |  |  |  |  |  |  |  |
Preferred stock, accretion to redemption value |  |  |  | $ 96,300 |  |  |  |  |  |  |  |  |  |  |
Number of trading periods |  |  |  | 20 days |  |  |  |  |  |  |  |  |  |  |
Conversion ceiling price of common stock |  |  |  | $ 2.25 |  |  |  |  |  |  |  |  |  |  |
Amendment Date |  |  |  | Dec. 08, 2017 |  |  |  |  |  |  |  |  |  |  |
Conversion floor price of common stock |  |  |  | $ 1.75 |  |  |  |  |  | $ 1.75 |  |  |  |  |
Fixed conversion price of common stock |  |  |  |  |  |  |  |  | $ 1.35 |  |  |  |  |  |
Derivative liability - embedded conversion feature |  | $ 66,200 |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative asset - embedded conversion feature |  |  |  |  | 98,700 |  |  |  |  |  |  |  |  |  |
Fair market value of embedded conversion feature, reclassed to equity |  |  |  |  |  | $ 108,900 |  |  |  |  |  |  |  |  |
Changes in fair value |  |  |  |  | $ (18,000) |  |  |  |  |  |  |  |  |  |
Preferred stock conversion price per share |  |  |  | 1.35 |  |  |  |  |  |  |  |  |  |  |
Redeemable Convertible Series B Preferred Stock [Member] | Exec Grants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subject to minimum conversion price per share of restricted stock |  |  |  | 1.75 |  |  |  |  |  |  |  |  |  |  |
Minimum grant conversion price per share of restricted stock |  |  |  | 1.75 |  |  |  |  |  |  |  |  |  |  |
Preferred stock conversion price per share |  |  |  | 1.35 |  |  |  |  |  |  |  |  |  |  |
Redeemable Convertible Series B Preferred Stock [Member] | Derivative Asset [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion floor price of common stock |  |  |  |  |  |  |  |  |  | 1.75 |  |  |  |  |
Redeemable Convertible Series B Preferred Stock [Member] | Derivative Liability [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion ceiling price of common stock |  |  |  |  |  |  |  |  |  | $ 2.25 |  |  |  |  |
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
WMIH Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  |  |  | 21,197,619 |  |  |  |  |  |  |
[1] | Balances derived from audited financial statements as of December 31, 2017.

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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=84159872&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=84159872&loc=d3e21484-112644 Reference 3: 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 4: 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 5: 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 + Details
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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The redemption (or callable) amount of currently redeemable preferred stock. Includes amounts representing dividends not currently declared or paid but which will be payable under the redemption features or for which ultimate payment is solely within the 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 FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21564-112644 + Details
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- Definition Date the preferred stock has been redeemed, in CCYY-MM-DD format. + References Reference 1: 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=84159872&loc=d3e21564-112644 Reference 2: 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=84159872&loc=d3e21475-112644 + Details
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- Definition The price per share at which the 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 is redeemed or may be called at. The redemption features of this preferred 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=84159872&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=84159872&loc=d3e21564-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21488-112644 + 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 + 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=98514028&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=96867065&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=96867065&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=96867065&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 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 FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 3: 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 4: 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 + Details
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