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v2.4.1.9

Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended | 9 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2012 | Mar. 19, 2012 | Jan. 30, 2014
Disclosure - Income Taxes - Additional Information (Detail) [Line Items] |  |  |  |  |  |
Income tax at the federal statutory rate of 35% | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |  |  |  |  |
Income tax paid | $ 0 us-gaap_IncomeTaxesPaid | $ 0 us-gaap_IncomeTaxesPaid | $ 0 us-gaap_IncomeTaxesPaid |  |  |
Valuation allowance equal to net deferred federal income tax asset | 100.00%wmih_ValuationAllowanceEqualToNetDeferredFederalIncomeTaxAsset | 100.00%wmih_ValuationAllowanceEqualToNetDeferredFederalIncomeTaxAsset | 100.00%wmih_ValuationAllowanceEqualToNetDeferredFederalIncomeTaxAsset | 100.00%wmih_ValuationAllowanceEqualToNetDeferredFederalIncomeTaxAsset |  |
Abandoned stock |  |  | 8,370,000,000 wmih_NonOperatingLossDueToAbandonOfStock | 8,370,000,000 wmih_NonOperatingLossDueToAbandonOfStock | 8,370,000,000 wmih_NonOperatingLossDueToAbandonOfStock |
Change in equity ownership | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage | 42.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
Available and utilizable NOL | 6,000,000,000 us-gaap_OperatingLossCarryforwards |  |  |  |  |
NOLs expiration date | 2031 |  |  |  |  |
Reserves for uncertain federal income tax positions | 0 wmih_ReserveForUncertainFederalIncomeTaxPosition |  |  |  |  |
Income tax interest income, expense or penalties | 0 us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense | 0 us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense | 0 us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense |  |  |
Successor [Member] |  |  |  |  |  |
Disclosure - Income Taxes - Additional Information (Detail) [Line Items] |  |  |  |  |  |
Net (loss) | 3,070,000 us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 338,000 us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  | (12,353,000)us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Income tax expense or benefit | 0 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Income tax at the federal statutory rate of 35% | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  | (35.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Predecessor [Member] |  |  |  |  |  |
Disclosure - Income Taxes - Additional Information (Detail) [Line Items] |  |  |  |  |  |
Net (loss) |  |  | (15,800,000)us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  | (3,433,000)us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Income tax expense or benefit |  |  | $ 0 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |
Income tax at the federal statutory rate of 35% |  |  |  |  | (35.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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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 The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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