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Fresh Start Accounting - Adjustment Reflects Elimination of Adjusted Retained Earnings (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 19, 2012 | Dec. 31, 2014 | Dec. 31, 2013
Adjustment reflects the elimination of adjusted retained earnings |  |  |
Retained earnings |  | $ 18,400 us-gaap_RetainedEarningsAccumulatedDeficit | $ 12,015 us-gaap_RetainedEarningsAccumulatedDeficit
Adjustment for carve-out allocations | 23,109 us-gaap_FreshStartAdjustmentIncreaseDecreaseRetainedEarningsDeficit |  |
Retained earnings, Fair Value Adjustments | (124,786)wmih_PreconfirmationFairValueAdjustmentRetainedEarningsDeficit |  |
Predecessor [Member] |  |  |
Adjustment reflects the elimination of adjusted retained earnings |  |  |
Retained earnings | 101,677 us-gaap_RetainedEarningsAccumulatedDeficit / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Adjustment for carve-out allocations | 23,109 us-gaap_FreshStartAdjustmentIncreaseDecreaseRetainedEarningsDeficit / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |
Retained earnings, Fair Value Adjustments | $ 124,786 wmih_PreconfirmationFairValueAdjustmentRetainedEarningsDeficit / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |

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- Definition Amount of fresh-start adjustment to retained earnings or deficit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=34712771&loc=d3e56426-112766 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=6916575&loc=d3e55811-112764 + Details
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- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Preconfirmation fair value adjustment retained earnings deficit. + References No definition available. + Details
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