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Insurance Activity - Components of Liability for Losses and Loss Adjustment Reserves (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Effects of Reinsurance [Line Items] |  |  |  |
Total losses and loss adjustment reserves | $ 18,947 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet | $ 44,314 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet | $ 82,524 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet | $ 142,119 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet
Case-basis reserves [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Total losses and loss adjustment reserves | 16,538 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet / us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis = wmih_CaseBasisReservesMember | 41,159 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet / us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis = wmih_CaseBasisReservesMember |  |
IBNR reserves [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Total losses and loss adjustment reserves | 110 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet / us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis = wmih_IbnrReservesMember | 713 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet / us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis = wmih_IbnrReservesMember |  |
Premium deficiency reserves [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Total losses and loss adjustment reserves | $ 2,299 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet / us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis = wmih_PremiumDeficitReservesMember | $ 2,442 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet / us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis = wmih_PremiumDeficitReservesMember |  |

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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph a -Article 7 + Details
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