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Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands, except Share data | Total | Predecessor [Member] USD ($) | Successor [Member] USD ($) | Common Stock [Member] | Common Stock [Member] Predecessor [Member] USD ($) | Common Stock [Member] Successor [Member] USD ($) | Preferred Stock [Member] Successor [Member] | Additional Paid-In Capital [Member] Predecessor [Member] USD ($) | Additional Paid-In Capital [Member] Successor [Member] USD ($) | Accumulated earnings (deficit) [Member] Predecessor [Member] USD ($) | Accumulated earnings (deficit) [Member] Successor [Member] USD ($)
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Beginning Balance at Dec. 31, 2011 |  | $ 174,990 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  | $ 1 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  | $ 69,879 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  | $ 105,110 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Beginning Balance, Shares at Dec. 31, 2011 |  |  |  |  | 1,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |
Net (loss) |  | (3,433)us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  | (3,433)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Allocated carve-out costs |  | 23,108 wmih_AllocatedCarveOutCost / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  | 23,108 wmih_AllocatedCarveOutCost / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Cancellation of Predecessor common stock |  | (194,665)us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationForfeited / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  | (1)us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  | (69,879)us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  | (124,785)us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Cancellation of Predecessor common stock, shares |  |  |  |  | (1,000)us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |
Issuance of common stock |  | 76,600 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  | 2 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  | 76,598 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |
Issuance of common stock, Shares |  |  |  | 200,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 200,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |
Ending Balance at Mar. 19, 2012 |  | 171,557 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  | 1 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  | 69,879 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  | 101,677 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Ending Balance, Shares at Mar. 19, 2012 |  |  |  |  | 1,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |
Beginning Balance at Dec. 31, 2011 |  | 174,990 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Net (loss) |  | (15,800)us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Ending Balance, Shares at Dec. 31, 2012 | 201,156,078 us-gaap_CommonStockSharesOutstanding |  |  |  |  |  |  |  |  |  |
Beginning Balance at Mar. 19, 2012 |  |  | 76,600 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  | 2 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  | 76,598 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Beginning Balance, Shares at Mar. 19, 2012 |  |  |  |  |  | 200,000,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |  |
Net (loss) |  |  | (12,353)us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |  |  |  |  | (12,353)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Issuance of common stock under restricted share compensation arrangement, Shares |  |  |  |  |  | 1,156,078 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |  |
Equity-based compensation |  |  | 143 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |  |  | 143 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Ending Balance at Dec. 31, 2012 |  |  | 64,390 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  | 2 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  | 76,741 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  | (12,353)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Ending Balance, Shares at Dec. 31, 2012 | 201,156,078 us-gaap_CommonStockSharesOutstanding |  |  |  |  | 201,156,078 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |  |
Net (loss) |  |  | 338 us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |  |  |  |  | 338 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Issuance of common stock under restricted share compensation arrangement, Shares |  |  |  |  |  | 686,273 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |  |
Equity-based compensation |  |  | 401 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |  |  | 401 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Issuance of preferred stock, net of offering costs, Shares | 0 us-gaap_PreferredStockSharesIssued |  |  |  |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2013 |  |  | 65,129 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  | 2 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  | 77,142 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  | (12,015)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Ending Balance, Shares at Dec. 31, 2013 | 201,842,351 us-gaap_CommonStockSharesOutstanding |  |  |  |  | 201,842,351 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |  |
Net (loss) |  |  | 3,070 us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |  |  |  |  | 3,070 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Issuance of common stock under restricted share compensation arrangement, Shares |  |  |  |  |  | 500,894 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |  |
Equity-based compensation |  |  | 807 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |  |  | 807 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Issuance of preferred stock, net of offering costs |  |  | 19,224 wmih_PreferredStockIssuedDuringPeriodValueNewIssues / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |  |  | 19,224 wmih_PreferredStockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Issuance of preferred stock, net of offering costs, Shares | 1,000,000 us-gaap_PreferredStockSharesIssued |  |  |  |  |  | 1,000,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Preferred deemed dividend |  |  | (9,455)us-gaap_DividendsPreferredStock / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |  |  | 9,455 us-gaap_DividendsPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  | (9,455)us-gaap_DividendsPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Ending Balance at Dec. 31, 2014 |  |  | $ 88,230 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  | $ 2 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  | $ 106,628 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  | $ (18,400)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Ending Balance, Shares at Dec. 31, 2014 | 202,343,245 us-gaap_CommonStockSharesOutstanding |  |  |  |  | 202,343,245 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 1,000,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |

X
- Definition This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415241&loc=d3e4534-113899 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11149-113907 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11178-113907 + Details
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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References No definition available. + Details
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- Definition Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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