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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended
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Dec. 31, 2014 | Dec. 31, 2012 | Dec. 31, 2013 | Mar. 19, 2012
Income Taxes And Tax Related [Line Items] |  |  |  |
Income tax at the federal statutory rate of 35% | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |  |  |
Successor [Member] |  |  |  |
Income Taxes And Tax Related [Line Items] |  |  |  |
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 |
Worthless stock deduction |  | $ (23,718)wmih_IncomeTaxReconciliationWorthlessStockDeductionOnInternationalSubsidiary / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | $ 13 wmih_IncomeTaxReconciliationWorthlessStockDeductionOnInternationalSubsidiary / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Cancelation of debt |  | 2,401 wmih_IncomeTaxReconciliationCancellationOfDebt / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
As filed adjustments |  |  | (14,505)wmih_IncomeTaxReconciliationFinancingArrangements / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Adjustments to NOL due to 382 limitation | (9)wmih_IncomeTaxReconciliationNetOperatingLossCarryforwards / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 4,518 wmih_IncomeTaxReconciliationNetOperatingLossCarryforwards / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Change in valuation allowance | (26)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 16,834 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 14,457 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Predecessor [Member] |  |  |  |
Income Taxes And Tax Related [Line Items] |  |  |  |
Income tax at the federal statutory rate of 35% |  |  |  | (35.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Change in valuation allowance |  |  |  | $ 35 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance / 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 Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + 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 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318 + Details
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- Definition Income tax reconciliation financing arrangements. + References No definition available. + Details
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- Definition Income tax reconciliation net operating loss carryforwards. + References No definition available. + Details
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- Definition Income tax reconciliation worthless stock deduction on international subsidiary. + References No definition available. + Details
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