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Net Income (Loss) Per Common Share - Calculation of Diluted Net Income (Loss) Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Numerator for basic and diluted net income (loss) per share: |  |  |
Net income (loss) | $ 5,501 us-gaap_NetIncomeLoss | $ (3,380)us-gaap_NetIncomeLoss | $ 3,070 us-gaap_NetIncomeLoss
Preferred deemed dividend |  | (9,455)wmih_PreferredDeemedDividend |
Series B preferred stock dividends | (4,248)us-gaap_DividendsPreferredStock |  |
Net income (loss) attributable to common shareholders | $ 1,253 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ (12,835)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |
Denominator for diluted net income (loss) per share: |  |  |
Weighted-average shares outstanding | 202,343,245 us-gaap_WeightedAverageNumberOfSharesIssuedBasic | 201,978,462 us-gaap_WeightedAverageNumberOfSharesIssuedBasic |
Weighted-average unvested restricted shares outstanding | (1,196,680)us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | (1,504,392)us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |
Effect of dilutive potential shares | 301,292,296 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment |  |
Denominator for diluted net income (loss) per share: | 502,438,861 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 200,474,070 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Diluted net income (loss) per share attributable to common shareholders | $ 0.00 us-gaap_EarningsPerShareDiluted | $ (0.06)us-gaap_EarningsPerShareDiluted |

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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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- Definition Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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- Definition This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2646-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 + Details
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