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Investment Securities - Summary of Net Investment Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 19, 2012
Successor [Member] |  |  |  |
Investment income (loss): |  |  |  |
Amortization of premium or discount on fixed-maturity securities | $ (1,837)us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | $ (1,663)us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | $ (2,309)us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Investment income on fixed-maturity securities | 7,232 wmih_InvestmentIncomeOnFixedMaturitySecurities / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 3,369 wmih_InvestmentIncomeOnFixedMaturitySecurities / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 6,588 wmih_InvestmentIncomeOnFixedMaturitySecurities / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Interest income on cash and equivalents | 161 us-gaap_InvestmentIncomeInterest / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 11 us-gaap_InvestmentIncomeInterest / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 10 us-gaap_InvestmentIncomeInterest / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Realized net gain (loss) from sale of investments | 2,747 us-gaap_GainLossOnSaleOfInvestments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 436 us-gaap_GainLossOnSaleOfInvestments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (1,575)us-gaap_GainLossOnSaleOfInvestments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Unrealized (losses) gains on trading securities held at period end | (1,410)us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (774)us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (3,492)us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Net investment income (loss) | 6,893 us-gaap_InvestmentIncomeNet / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 1,379 us-gaap_InvestmentIncomeNet / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (778)us-gaap_InvestmentIncomeNet / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Predecessor [Member] |  |  |  |
Investment income (loss): |  |  |  |
Amortization of premium or discount on fixed-maturity securities |  |  |  | (523)us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Investment income on fixed-maturity securities |  |  |  | 2,467 wmih_InvestmentIncomeOnFixedMaturitySecurities / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Interest income on cash and equivalents |  |  |  | 3 us-gaap_InvestmentIncomeInterest / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Realized net gain (loss) from sale of investments |  |  |  | 176 us-gaap_GainLossOnSaleOfInvestments / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Unrealized (losses) gains on trading securities held at period end |  |  |  | 1,049 us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Net investment income (loss) |  |  |  | $ 3,172 us-gaap_InvestmentIncomeNet / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

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- Definition The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(b)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount after accretion (amortization) of discount (premium), and investment expense, of interest income and dividend income on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(a),(b)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of accretion (amortization) of purchase discount (premium) on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 + Details
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- Definition Investment income on fixed-maturity securities. + References No definition available. + Details
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