XML 50 R39.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 19, 2012
Income Taxes [Line Items] |  |  |  |  |
Net (loss) income attributable to common and participating stockholders | $ (5,783,000) | $ 13,289,000 |  |  |
Percentage of net operating loss carry forwards | 100.00% |  |  |  |
Valuation allowance recorded to be reduce to | 0.00% |  |  |  |
Income tax expense or benefit | $ 0 |  |  | $ 0 |
Income tax at the federal statutory rate | 21.00% |  |  | 35.00% |
Income tax paid | $ 0 |  |  | $ 0 |
Reduction of deferred tax asset relating to NOL carry-forward | $ 842,900,000 |  |  |  |
Valuation allowance equal to net deferred federal income tax asset | 100.00% |  |  | 100.00% |
Abandoned stock |  |  |  |  | $ 8,400,000,000
Available and utilizable NOL carry forward |  |  |  | $ 6,000,000,000 |
NOLs expiration date | 2031 |  |  |  |
Capital loss carryforward subject to expiration year | 2018 |  |  | 2018 |
Reserves for uncertain federal income tax positions | $ 0 |  |  |  |
Income tax interest income, expense or penalties | $ 0 |  |  | $ 0 |
Income tax examination, year under examination | 2011 |  |  |  |
Capital Loss Subject to Expiration in 2018 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Capital loss carryforward | $ 1,600,000 |  |  | $ 1,600,000 |
Scenario Plan [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax at the federal statutory rate |  |  | 21.00% |  |

X
- 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=84230637&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=84230637&loc=d3e32698-109319 + Details
Name: | us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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=84230637&loc=d3e32718-109319 + Details
Name: | us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Tax year being audited in the income tax examination, in CCYY format. + References No definition available. + Details
Name: | us-gaap_IncomeTaxExaminationYearUnderExamination
Namespace Prefix: | us-gaap_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_IncomeTaxExpenseBenefit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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=98513485&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=98514028&loc=d3e3536-108585 + Details
Name: | us-gaap_IncomeTaxesPaid
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1377-109256 + Details
Name: | us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
Name: | us-gaap_OperatingLossCarryforwards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
Name: | us-gaap_TaxCreditCarryforwardAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Capital loss carryforward subject to expiration year. + References No definition available. + Details
Name: | wmih_CapitalLossCarryforwardSubjectToExpirationYear
Namespace Prefix: | wmih_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Income taxes. + References No definition available. + Details
Name: | wmih_IncomeTaxesLineItems
Namespace Prefix: | wmih_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net operating loss expiration date. + References No definition available. + Details
Name: | wmih_NetOperatingLossExpirationDate
Namespace Prefix: | wmih_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Non operating loss due to abandonment of stock. + References No definition available. + Details
Name: | wmih_NonOperatingLossDueToAbandonmentOfStock
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of valuation allowance applicable to net operating loss. + References No definition available. + Details
Name: | wmih_PercentageOfValuationAllowanceApplicableToNetOperatingLoss
Namespace Prefix: | wmih_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of valuation allowance applicable to net operating loss to be reduced. + References No definition available. + Details
Name: | wmih_PercentageOfValuationAllowanceApplicableToNetOperatingLossToBeReduced
Namespace Prefix: | wmih_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Reserve for uncertain federal income tax position. + References No definition available. + Details
Name: | wmih_ReserveForUncertainFederalIncomeTaxPosition
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Tax cuts and jobs act of 2017 incomplete accounting change in tax rate deferred tax assets provisional income tax benefit relating to net operating loss carryforward. + References No definition available. + Details
Name: | wmih_TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateDeferredTaxAssetsProvisionalIncomeTaxBenefitRelatingToNetOperatingLossCarryforward
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Valuation allowance equal to net deferred federal income tax asset. + References No definition available. + Details
Name: | wmih_ValuationAllowanceEqualToNetDeferredFederalIncomeTaxAsset
Namespace Prefix: | wmih_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_TaxCreditCarryforwardAxis=wmih_CapitalLossSubjectToExpirationInTwentyEighteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |