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Capital Stock - Schedule of Unamortized Value of Restricted Stock (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Amortization Expense [Line Items] |  |  |
Total unamortized value | $ 1,232 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized | $ 700 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized | $ 400 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized
1st quarter 2015 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Total unamortized value | 201 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized / us-gaap_VestingAxis = wmih_FirstQuarterTwoThousandAndFifteenMember |  |
2nd quarter 2015 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Total unamortized value | 162 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized / us-gaap_VestingAxis = wmih_SecondQuarterTwoThousandAndFifteenMember |  |
3rd quarter 2015 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Total unamortized value | 162 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized / us-gaap_VestingAxis = wmih_ThirdQuarterTwoThousandAndFifteenMember |  |
4th quarter 2015 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Total unamortized value | 162 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized / us-gaap_VestingAxis = wmih_FourthQuarterTwoThousandAndFifteenMember |  |
1st quarter 2016 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Total unamortized value | 154 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized / us-gaap_VestingAxis = wmih_FirstQuarterTwoThousandAndSixteenMember |  |
2nd quarter 2016 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Total unamortized value | 107 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized / us-gaap_VestingAxis = wmih_SecondQuarterTwoThousandAndSixteenMember |  |
3rd quarter 2016 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Total unamortized value | 107 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized / us-gaap_VestingAxis = wmih_ThirdQuarterTwoThousandAndSixteenMember |  |
4th quarter 2016 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Total unamortized value | 107 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized / us-gaap_VestingAxis = wmih_FourthQuarterTwoThousandAndSixteenMember |  |
1st quarter 2017 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Total unamortized value | $ 70 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized / us-gaap_VestingAxis = wmih_FirstQuarterTwoThousandAndSeventeenMember |  |

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