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Significant Accounting Policies - Additional Information (Detail) (USD $)
Share data in Millions, unless otherwise specified
3 Months Ended 0 Months Ended
Mar. 31, 2015
Jan. 05, 2015
Feb. 25, 2015
Jan. 30, 2015
Dec. 31, 2014
Feb. 10, 2014
May 22, 2012
Mar. 19, 2012
Significant Accounting Policies [Line Items]                
Unearned premiums $ 934,000us-gaap_UnearnedPremiums       $ 1,094,000us-gaap_UnearnedPremiums      
Premium deficiency reserves 2,300,000wmih_PremiumDeficiencyReserves       2,300,000wmih_PremiumDeficiencyReserves      
Maximum percent of the voting shares of the emerging entity immediately prior to the confirmation of reorganization 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage     42.50%us-gaap_EquityMethodInvestmentOwnershipPercentage       50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
Company's reorganization value               76,600,000us-gaap_ReorganizationValue
Comprehensive income (loss) 0us-gaap_ComprehensiveIncomeNetOfTax              
Common stock reserved for future issuance     12.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant     3.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant 2.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant  
Amount of dividends paid on or after Effective Date 0wmih_AmountOfDividendsPaidOnOrAfterEffectiveDate              
Preferred stock dividends 700,000us-gaap_DividendsPreferredStockStock              
Preferred stock dividend rate 3.00%us-gaap_PreferredStockDividendRatePercentage              
Series B Preferred Stock [Member]                
Significant Accounting Policies [Line Items]                
Preferred stock dividends $ 3,500,000us-gaap_DividendsPreferredStockStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
             
Preferred stock dividend rate   3.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember