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Capital Stock - Schedule of Unamortized Value of Restricted Stock (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Amortization Expense [Line Items] |  |
Total unamortized value | $ 848 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized | $ 1,200 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized
2nd quarter 2015 [Member] |  |
Amortization Expense [Line Items] |  |
Total unamortized value | 130 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized / us-gaap_VestingAxis = wmih_SecondQuarterTwoThousandAndFifteenMember |
3rd quarter 2015 [Member] |  |
Amortization Expense [Line Items] |  |
Total unamortized value | 130 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized / us-gaap_VestingAxis = wmih_ThirdQuarterTwoThousandAndFifteenMember |
4th quarter 2015 [Member] |  |
Amortization Expense [Line Items] |  |
Total unamortized value | 130 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized / us-gaap_VestingAxis = wmih_FourthQuarterTwoThousandAndFifteenMember |
1st quarter 2016 [Member] |  |
Amortization Expense [Line Items] |  |
Total unamortized value | 125 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized / us-gaap_VestingAxis = wmih_FirstQuarterTwoThousandAndSixteenMember |
2nd quarter 2016 [Member] |  |
Amortization Expense [Line Items] |  |
Total unamortized value | 92 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized / us-gaap_VestingAxis = wmih_SecondQuarterTwoThousandAndSixteenMember |
3rd quarter 2016 [Member] |  |
Amortization Expense [Line Items] |  |
Total unamortized value | 92 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized / us-gaap_VestingAxis = wmih_ThirdQuarterTwoThousandAndSixteenMember |
4th quarter 2016 [Member] |  |
Amortization Expense [Line Items] |  |
Total unamortized value | 92 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized / us-gaap_VestingAxis = wmih_FourthQuarterTwoThousandAndSixteenMember |
1st quarter 2017 [Member] |  |
Amortization Expense [Line Items] |  |
Total unamortized value | $ 57 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized / us-gaap_VestingAxis = wmih_FirstQuarterTwoThousandAndSeventeenMember |

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