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Capital Stock - Schedule of Vesting Shares Subject to Repurchase (Detail) (Restricted shares subject to repurchase [Member]) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Amortization Expense [Line Items] |  |  |
Unvested shares | 1,343,764 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber | 1,456,987 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber | 1,156,078 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
1st quarter 2015 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Unvested shares | 781,080 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = wmih_UnvestedRestrictedCommonStockSubjectToRepurchaseMember / us-gaap_VestingAxis = wmih_FirstQuarterTwoThousandAndFifteenMember |  |
1st quarter 2016 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Unvested shares | 395,716 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = wmih_UnvestedRestrictedCommonStockSubjectToRepurchaseMember / us-gaap_VestingAxis = wmih_FirstQuarterTwoThousandAndSixteenMember |  |
1st quarter 2017 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Unvested shares | 166,968 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = wmih_UnvestedRestrictedCommonStockSubjectToRepurchaseMember / us-gaap_VestingAxis = wmih_FirstQuarterTwoThousandAndSeventeenMember |  |

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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
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | wmih_AmortizationExpenseLineItems
Namespace Prefix: | wmih_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration