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Fair Value Measurement - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Jan. 05, 2015
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Preferred stock liquidation preference per share | $ 10.00 us-gaap_PreferredStockLiquidationPreference |  |  |
Preferred stock dividend rate | 3.00%us-gaap_PreferredStockDividendRatePercentage |  |  |
Common stock, par value | $ 0.00001 us-gaap_CommonStockParOrStatedValuePerShare |  | $ 0.00001 us-gaap_CommonStockParOrStatedValuePerShare |
Net income (loss) | $ 5,501,000 us-gaap_NetIncomeLoss | $ (3,380,000)us-gaap_NetIncomeLoss | $ 3,070,000 us-gaap_NetIncomeLoss |
Minimum [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Percentage of closing stock price | 10.00%wmih_PercentageOfClosingStockPrice / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Estimated net income | 37,200,000 wmih_EstimatedNetIncomeLoss / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Maximum [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Percentage of closing stock price | 10.00%wmih_PercentageOfClosingStockPrice / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Estimated net income | 37,100,000 wmih_EstimatedNetIncomeLoss / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Initial Conversion Price |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Common stock, par value | $ 2.25 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_ShareholdersEquityClassAxis = wmih_InitialConversionPriceMember |  |  |
Floor Price |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Common stock, par value | $ 1.75 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_ShareholdersEquityClassAxis = wmih_FloorPriceMember |  |  |
Volatility Assumption [Member] | Minimum [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Percentage of closing stock price | 10.00%wmih_PercentageOfClosingStockPrice / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ShareholdersEquityClassAxis = wmih_VolatilityAssumptionMember |  |  |
Estimated net income | 11,300,000 wmih_EstimatedNetIncomeLoss / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ShareholdersEquityClassAxis = wmih_VolatilityAssumptionMember |  |  |
Volatility Assumption [Member] | Maximum [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Percentage of closing stock price | 10.00%wmih_PercentageOfClosingStockPrice / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ShareholdersEquityClassAxis = wmih_VolatilityAssumptionMember |  |  |
Estimated net income | 11,500,000 wmih_EstimatedNetIncomeLoss / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ShareholdersEquityClassAxis = wmih_VolatilityAssumptionMember |  |  |
Transaction Occurring Assumption [Member] | Minimum [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Percentage of closing stock price | 10.00%wmih_PercentageOfClosingStockPrice / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ShareholdersEquityClassAxis = wmih_TransactionOccurringAssumptionMember |  |  |
Estimated net income | 6,600,000 wmih_EstimatedNetIncomeLoss / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ShareholdersEquityClassAxis = wmih_TransactionOccurringAssumptionMember |  |  |
Transaction Occurring Assumption [Member] | Maximum [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Percentage of closing stock price | 10.00%wmih_PercentageOfClosingStockPrice / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ShareholdersEquityClassAxis = wmih_TransactionOccurringAssumptionMember |  |  |
Estimated net income | 6,600,000 wmih_EstimatedNetIncomeLoss / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ShareholdersEquityClassAxis = wmih_TransactionOccurringAssumptionMember |  |  |
Series B Preferred Stock [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Capital |  |  |  | $ 600,000,000 us-gaap_Capital / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Convertible preferred stock, shares issued | 600,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  | 0 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 600,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Preferred stock liquidation preference per share |  |  |  | $ 1,000 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Preferred stock dividend rate |  |  |  | 3.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Common stock, par value | $ 1.75 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |
Series B Preferred Stock [Member] | Maximum [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Common stock, par value | $ 2.25 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |

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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 + Details
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