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v2.4.1.9

Fresh Start Accounting - Assets and Liabilities at Fair Value (Parenthetical) (Detail) (USD $) | 0 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 19, 2012 | Mar. 19, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Fresh-Start Adjustment [Line Items] |  |  |  |  |
Common stock, par value |  |  | $ 0.00001 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.00001 us-gaap_CommonStockParOrStatedValuePerShare |
Common stock, shares outstanding |  |  | 202,343,245 us-gaap_CommonStockSharesOutstanding | 201,842,351 us-gaap_CommonStockSharesOutstanding | 201,156,078 us-gaap_CommonStockSharesOutstanding
Common stock, shares issued |  |  | 202,343,245 us-gaap_CommonStockSharesIssued | 201,842,351 us-gaap_CommonStockSharesIssued |
Common stock, shares authorized |  |  | 500,000,000 us-gaap_CommonStockSharesAuthorized | 500,000,000 us-gaap_CommonStockSharesAuthorized |
Loss contract fair market value reserve | $ 63,100,000 wmih_LossContractFairMarketValueReserve | $ 63,100,000 wmih_LossContractFairMarketValueReserve | $ 12,549,000 wmih_LossContractFairMarketValueReserve | $ 46,319,000 wmih_LossContractFairMarketValueReserve |
Reduction in WMMRC's FMV | 8,400,000 wmih_FairMarketValueReduction | 8,400,000 wmih_FairMarketValueReduction |  |  |
Value related to NOLs | 70,000,000 wmih_EliminationOfNetOperatingLossValue | 70,000,000 wmih_EliminationOfNetOperatingLossValue |  |  |
Valuation allowance | 100.00%wmih_PercentageOfValuationAllowanceApplicableToNetOperatingLoss | 100.00%wmih_PercentageOfValuationAllowanceApplicableToNetOperatingLoss |  |  |
Runoff Notes [Member] |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |
Outstanding amount of notes | 130,000,000 us-gaap_NotesPayableToBank / us-gaap_DebtInstrumentAxis = wmih_RunoffNotesMember | 130,000,000 us-gaap_NotesPayableToBank / us-gaap_DebtInstrumentAxis = wmih_RunoffNotesMember |  |  |
WMMRC [Member] |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |
Court's valuation of WMMRC | 140,000,000 wmih_CourtValuation / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wmih_WmmrcMember | 140,000,000 wmih_CourtValuation / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wmih_WmmrcMember |  |  |
Net assets or equity value | 171,600,000 wmih_NetAssetsOrEquityValue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wmih_WmmrcMember | 171,600,000 wmih_NetAssetsOrEquityValue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wmih_WmmrcMember |  |  |
Reduction in WMMRC's FMV | 8,400,000 wmih_FairMarketValueReduction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wmih_WmmrcMember | 8,400,000 wmih_FairMarketValueReduction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wmih_WmmrcMember |  |  |
Reorganization Adjustments [Member] |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |
Common stock, par value | $ 0.00001 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementScenarioAxis = wmih_BeforeAdjustingForFMVMember | $ 0.00001 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementScenarioAxis = wmih_BeforeAdjustingForFMVMember |  |  |
Common stock, shares outstanding | 200,000,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementScenarioAxis = wmih_BeforeAdjustingForFMVMember | 200,000,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementScenarioAxis = wmih_BeforeAdjustingForFMVMember |  |  |
Common stock, shares issued | 200,000,000 us-gaap_CommonStockSharesIssued / us-gaap_StatementScenarioAxis = wmih_BeforeAdjustingForFMVMember | 200,000,000 us-gaap_CommonStockSharesIssued / us-gaap_StatementScenarioAxis = wmih_BeforeAdjustingForFMVMember |  |  |
Common stock, shares authorized | 500,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementScenarioAxis = wmih_BeforeAdjustingForFMVMember | 500,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementScenarioAxis = wmih_BeforeAdjustingForFMVMember |  |  |
Fair Value Adjustments [Member] |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |
Common stock, par value | $ 1 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementScenarioAxis = wmih_EliminationOfPredecessorMember | $ 1 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementScenarioAxis = wmih_EliminationOfPredecessorMember |  |  |
Common stock, shares outstanding | 1,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementScenarioAxis = wmih_EliminationOfPredecessorMember | 1,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementScenarioAxis = wmih_EliminationOfPredecessorMember |  |  |
Common stock, shares issued | 1,000 us-gaap_CommonStockSharesIssued / us-gaap_StatementScenarioAxis = wmih_EliminationOfPredecessorMember | 1,000 us-gaap_CommonStockSharesIssued / us-gaap_StatementScenarioAxis = wmih_EliminationOfPredecessorMember |  |  |
Successor [Member] |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |
Common stock, par value | $ 0.00001 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | $ 0.00001 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |
Common stock, shares issued | 200,000,000 us-gaap_CommonStockSharesIssued / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 200,000,000 us-gaap_CommonStockSharesIssued / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |
Predecessor [Member] |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |
Increase in equity value | 194,700,000 us-gaap_StockholdersEquityPeriodIncreaseDecrease / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |
Cash contributed to the Company by creditors | $ 75,000,000 wmih_CashFromUsedInReorganizationActivities / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | $ 75,000,000 wmih_CashFromUsedInReorganizationActivities / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |
Reorganization Adjustments [Member] |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |
Common stock, shares issued | 200,000,000 us-gaap_CommonStockSharesIssued / us-gaap_StatementScenarioAxis = wmih_ReorganizationAdjustmentsMember | 200,000,000 us-gaap_CommonStockSharesIssued / us-gaap_StatementScenarioAxis = wmih_ReorganizationAdjustmentsMember |  |  |

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- Definition Including the current and noncurrent portions, the carrying value as of the balance sheet date of notes payable to banks, excluding mortgage notes, initially due beyond one year or beyond the operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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