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Investment Securities - Schedule of Investments in Accordance with Fair Value Measurement (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Class of Security: |  |
Total fixed-maturity securities | $ 60,641 wmih_FixedMaturitySecuritiesEstimatedFairValue | $ 218,801 wmih_FixedMaturitySecuritiesEstimatedFairValue
Total investments fair value | 149,492 us-gaap_AvailableForSaleSecurities | 263,664 us-gaap_AvailableForSaleSecurities
Fair Value, Inputs, Level 1 |  |
Class of Security: |  |
Total fixed-maturity securities | 20,770 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 124,774 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Total investments fair value | 109,621 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 169,637 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 |  |
Class of Security: |  |
Total fixed-maturity securities | 39,871 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 94,027 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Total investments fair value | 39,871 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 94,027 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Obligations of U.S. Government Sponsored Enterprises [Member] |  |
Class of Security: |  |
Total fixed-maturity securities | 6,475 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 15,832 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Obligations of U.S. Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 1 |  |
Class of Security: |  |
Total fixed-maturity securities | 3,009 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 6,299 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Obligations of U.S. Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 2 |  |
Class of Security: |  |
Total fixed-maturity securities | 3,466 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 9,533 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Corporate Debt Securities [Member] |  |
Class of Security: |  |
Total fixed-maturity securities | 41,484 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember | 81,892 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 |  |
Class of Security: |  |
Total fixed-maturity securities | 14,939 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 11,891 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 |  |
Class of Security: |  |
Total fixed-maturity securities | 26,545 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 70,001 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Commercial Paper [Member] |  |
Class of Security: |  |
Total fixed-maturity securities |  | 98,932 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialPaperMember
Commercial Paper [Member] | Fair Value, Inputs, Level 1 |  |
Class of Security: |  |
Total fixed-maturity securities |  | 98,932 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialPaperMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Foreign Corporate Debt Securities [Member] |  |
Class of Security: |  |
Total fixed-maturity securities | 12,682 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ForeignCorporateDebtSecuritiesMember | 22,145 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ForeignCorporateDebtSecuritiesMember
Foreign Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 |  |
Class of Security: |  |
Total fixed-maturity securities | 2,822 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ForeignCorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 7,652 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ForeignCorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Foreign Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 |  |
Class of Security: |  |
Total fixed-maturity securities | 9,860 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ForeignCorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 14,493 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ForeignCorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Money Market Funds [Member] |  |
Class of Security: |  |
Total investments fair value | 88,851 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_MoneyMarketFundsMember | 44,863 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_MoneyMarketFundsMember
Money Market Funds [Member] | Fair Value, Inputs, Level 1 |  |
Class of Security: |  |
Total investments fair value | $ 88,851 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | $ 44,863 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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