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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Convertible preferred stock, par value $ 0.00001us-gaap_PreferredStockParOrStatedValuePerShare $ 0.00001us-gaap_PreferredStockParOrStatedValuePerShare
Common stock, par value $ 0.00001us-gaap_CommonStockParOrStatedValuePerShare $ 0.00001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 500,000,000us-gaap_CommonStockSharesAuthorized 500,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 202,343,245us-gaap_CommonStockSharesIssued 202,343,245us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 202,343,245us-gaap_CommonStockSharesOutstanding 202,343,245us-gaap_CommonStockSharesOutstanding
Redeemable Convertible Preferred Stock    
Redeemable Convertible preferred stock, par value $ 0.00001us-gaap_TemporaryEquityParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
$ 0.00001us-gaap_TemporaryEquityParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
Redeemable Convertible preferred stock, shares issued 600,000us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
0us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
Redeemable Convertible preferred stock, shares outstanding 600,000us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
0us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
Redeemable Convertible preferred stock, liquidation value $ 600,000,000us-gaap_TemporaryEquityLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
$ 0us-gaap_TemporaryEquityLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
Convertible Series A    
Convertible preferred stock, par value $ 0.00001us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= wmih_ConvertibleSeriesAMember
$ 0.00001us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= wmih_ConvertibleSeriesAMember
Convertible preferred stock, shares issued 1,000,000us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= wmih_ConvertibleSeriesAMember
1,000,000us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= wmih_ConvertibleSeriesAMember
Convertible preferred stock, shares outstanding 1,000,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= wmih_ConvertibleSeriesAMember
1,000,000us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= wmih_ConvertibleSeriesAMember
Convertible preferred stock, liquidation value $ 10us-gaap_PreferredStockLiquidationPreferenceValue
/ us-gaap_StatementClassOfStockAxis
= wmih_ConvertibleSeriesAMember
$ 10us-gaap_PreferredStockLiquidationPreferenceValue
/ us-gaap_StatementClassOfStockAxis
= wmih_ConvertibleSeriesAMember