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v2.4.1.9

Notes Payable - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |
Collateral Account used for future payments | $ 2.4 us-gaap_CashCollateralForBorrowedSecurities | $ 0.1 us-gaap_CashCollateralForBorrowedSecurities | $ 25.0 us-gaap_CashCollateralForBorrowedSecurities
Principal and interest payments | 2.4 us-gaap_DebtInstrumentPeriodicPayment | 0.1 us-gaap_DebtInstrumentPeriodicPayment | 25.0 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 | 78.9 wmih_RedemptionAmountOfPrincipal / us-gaap_LongtermDebtTypeAxis = wmih_ThirteenPercentSeniorFirstLienNotesMember | 36.3 wmih_RedemptionAmountOfPrincipal / us-gaap_LongtermDebtTypeAxis = wmih_ThirteenPercentSeniorFirstLienNotesMember | 2.1 wmih_RedemptionAmountOfPrincipal / us-gaap_LongtermDebtTypeAxis = wmih_ThirteenPercentSeniorFirstLienNotesMember
Cash interest paid on Notes | 5.2 us-gaap_InterestExpenseLongTermDebt / us-gaap_LongtermDebtTypeAxis = wmih_ThirteenPercentSeniorFirstLienNotesMember | 9.7 us-gaap_InterestExpenseLongTermDebt / us-gaap_LongtermDebtTypeAxis = wmih_ThirteenPercentSeniorFirstLienNotesMember | 3.7 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 | 18.5 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_PaymentInKindPIKNoteMember | 13.9 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_PaymentInKindPIKNoteMember | 8.3 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_PaymentInKindPIKNoteMember
Runoff Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Outstanding amounts of notes | $ 31.2 wmih_NotesPayableOutstanding / us-gaap_LongtermDebtTypeAxis = wmih_RunoffNotesMember | $ 105.5 wmih_NotesPayableOutstanding / us-gaap_LongtermDebtTypeAxis = wmih_RunoffNotesMember | $ 136.3 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 Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + 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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- Definition Amount of the required periodic payments including both interest and principal payments. + 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 210.5-02.22) -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 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Aggregate amount of interest paid or due on all long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.8) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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