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Fresh Start Accounting - Additional Information (Detail) (USD $) | Dec. 31, 2014 | Jan. 30, 2014 | Dec. 31, 2013 | Mar. 19, 2012
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Statement Of Financial Position [Abstract] |  |  |  |
Maximum percent of the voting shares of the emerging entity immediately prior to the confirmation of reorganization | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage | 42.50%us-gaap_EquityMethodInvestmentOwnershipPercentage |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
Company's reorganization value |  |  |  | $ 76,600,000 us-gaap_ReorganizationValue
Amount of cash used for Plan-related liabilities | 76,600,000 us-gaap_PlanOfReorganizationAmountOfPrepetitionObligationsSettledOrToBeSettledInCashAtEffectiveDate |  |  |
Loss contract fair market value reserve | $ 12,549,000 wmih_LossContractFairMarketValueReserve |  | $ 46,319,000 wmih_LossContractFairMarketValueReserve | $ 63,100,000 wmih_LossContractFairMarketValueReserve

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition Amount of prepetition liabilities to be settled in cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6916575&loc=d3e55696-112764 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=34712771&loc=d3e56451-112766 + Details
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- Definition Amount attributed to the reconstituted entity, as well as the expected net realizable value of those assets that will be disposed before reconstitution occurs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reorganization Value -URI http://asc.fasb.org/extlink&oid=29635974 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=34712771&loc=d3e56426-112766 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 05 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6458260&loc=d3e54813-112758 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=34712771&loc=d3e56239-112766 + Details
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- Definition Loss contract fair market value reserve. + References No definition available. + Details
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