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v2.4.1.9

Notes Payable - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
Debt Instrument [Line Items] |  |  |
Collateral Account used for future payments | $ 3.1 us-gaap_CashCollateralForBorrowedSecurities | $ 2.4 us-gaap_CashCollateralForBorrowedSecurities |
Principal and interest payments | 3.1 us-gaap_DebtInstrumentPeriodicPayment | 2.4 us-gaap_DebtInstrumentPeriodicPayment |
13% Senior First Lien Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Issued aggregate principal amount | 110.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = wmih_ThirteenPercentSeniorFirstLienNotesMember |  |
Notes maturity date | Mar. 19, 2030 |  |
Principal payments | 2.3 wmih_RedemptionAmountOfPrincipal / us-gaap_LongtermDebtTypeAxis = wmih_ThirteenPercentSeniorFirstLienNotesMember | 78.9 wmih_RedemptionAmountOfPrincipal / us-gaap_LongtermDebtTypeAxis = wmih_ThirteenPercentSeniorFirstLienNotesMember |
Cash interest paid on Notes | 0.1 us-gaap_InterestExpenseLongTermDebt / us-gaap_LongtermDebtTypeAxis = wmih_ThirteenPercentSeniorFirstLienNotesMember |  | 1.5 us-gaap_InterestExpenseLongTermDebt / us-gaap_LongtermDebtTypeAxis = wmih_ThirteenPercentSeniorFirstLienNotesMember
13% Senior Second Lien Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Issued aggregate principal amount | 20.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = wmih_ThirteenPercentSeniorSecondLienNotesMember |  |
Notes maturity date | Mar. 19, 2030 |  |
PIK Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Issued aggregate principal amount | 19.4 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_PaymentInKindPIKNoteMember | 18.5 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_PaymentInKindPIKNoteMember |
Runoff Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Outstanding amounts of notes | $ 29.8 wmih_NotesPayableOutstanding / us-gaap_LongtermDebtTypeAxis = wmih_RunoffNotesMember | $ 31.2 wmih_NotesPayableOutstanding / us-gaap_LongtermDebtTypeAxis = wmih_RunoffNotesMember |

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- Definition Carrying amount as of the balance sheet date of cash collateral held for borrowed securities, for which the cash is restricted as to withdrawal or usage. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.1) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),2) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 7 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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