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Investment Securities - Schedule of Investments in Accordance with Fair Value Measurement (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Class of Securities: |  |
Total fixed-maturity securities | $ 119,999 wmih_FixedMaturitySecuritiesEstimatedFairValue | $ 60,641 wmih_FixedMaturitySecuritiesEstimatedFairValue
Total investments fair value | 131,291 us-gaap_AvailableForSaleSecurities | 149,492 us-gaap_AvailableForSaleSecurities
Level 1 |  |
Class of Securities: |  |
Total fixed-maturity securities | 87,121 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 20,770 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Total investments fair value | 98,413 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 109,621 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 2 |  |
Class of Securities: |  |
Total fixed-maturity securities | 32,878 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 39,871 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Total investments fair value | 32,878 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 39,871 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Obligations of U.S. Government Sponsored Enterprises [Member] |  |
Class of Securities: |  |
Total fixed-maturity securities | 75,464 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 6,475 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Obligations of U.S. Government Sponsored Enterprises [Member] | Level 1 |  |
Class of Securities: |  |
Total fixed-maturity securities | 71,979 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 3,009 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Obligations of U.S. Government Sponsored Enterprises [Member] | Level 2 |  |
Class of Securities: |  |
Total fixed-maturity securities | 3,485 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 3,466 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Corporate Debt Securities [Member] |  |
Class of Securities: |  |
Total fixed-maturity securities | 28,587 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember | 41,484 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember
Corporate Debt Securities [Member] | Level 1 |  |
Class of Securities: |  |
Total fixed-maturity securities | 9,071 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 14,939 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Corporate Debt Securities [Member] | Level 2 |  |
Class of Securities: |  |
Total fixed-maturity securities | 19,516 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 26,545 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Commercial Paper [Member] |  |
Class of Securities: |  |
Total fixed-maturity securities | 4,999 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialPaperMember |
Commercial Paper [Member] | Level 1 |  |
Class of Securities: |  |
Total fixed-maturity securities | 4,999 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialPaperMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
Foreign Corporate Debt Securities [Member] |  |
Class of Securities: |  |
Total fixed-maturity securities | 10,949 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ForeignCorporateDebtSecuritiesMember | 12,682 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ForeignCorporateDebtSecuritiesMember
Foreign Corporate Debt Securities [Member] | Level 1 |  |
Class of Securities: |  |
Total fixed-maturity securities | 1,072 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ForeignCorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 2,822 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ForeignCorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Foreign Corporate Debt Securities [Member] | Level 2 |  |
Class of Securities: |  |
Total fixed-maturity securities | 9,877 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ForeignCorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 9,860 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = us-gaap_ForeignCorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Money Market Funds [Member] |  |
Class of Securities: |  |
Total investments fair value | 11,292 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_MoneyMarketFundsMember | 88,851 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_MoneyMarketFundsMember
Money Market Funds [Member] | Level 1 |  |
Class of Securities: |  |
Total investments fair value | $ 11,292 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByAssetClassAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | $ 88,851 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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