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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
Amortization Expense [Line Items]      
Unvested shares 1,343,764us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 1,456,987us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 1,156,078us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
1st quarter 2015 [Member]
      
Amortization Expense [Line Items]      
Unvested shares 781,080us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= wmih_UnvestedRestrictedCommonStockSubjectToRepurchaseMember
/ us-gaap_VestingAxis
= wmih_FirstQuarterTwoThousandAndFifteenMember		    
1st quarter 2016 [Member]
      
Amortization Expense [Line Items]      
Unvested shares 395,716us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= wmih_UnvestedRestrictedCommonStockSubjectToRepurchaseMember
/ us-gaap_VestingAxis
= wmih_FirstQuarterTwoThousandAndSixteenMember		    
1st quarter 2017 [Member]
      
Amortization Expense [Line Items]      
Unvested shares 166,968us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= wmih_UnvestedRestrictedCommonStockSubjectToRepurchaseMember
/ us-gaap_VestingAxis
= wmih_FirstQuarterTwoThousandAndSeventeenMember