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Capital Stock - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 19, 2013 | Mar. 31, 2013 Y | Mar. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Capital Stock Distribution [Line Items] |  |  |  |  |
Common stock, shares authorized |  | 500,000,000 |  | 500,000,000 |
Preferred stock, shares authorized |  | 5,000,000 |  | 5,000,000 |
Preferred stock, par value |  | $ 0.00001 |  | $ 0.00001 |
Common stock, par value |  | $ 0.00001 |  | $ 0.00001 |
Common stock, shares issued |  | 201,156,078 |  | 201,156,078 |
Amount of restricted share grants |  | $ 0 |  | $ 550,000 |
Unamortized value of unvested restricted share grant |  | 361,000 |  | 407,000 |
Amortized period for unvested restricted share |  | 2.0 |  |  |
Stock-based compensation |  | $ 46,000 | $ 0 |  |
Award vesting period |  | 3 years |  |  |
Award vesting rights |  | 1/3 per year |  |  |
Number of shares vested | 385,364 | 385,364 |  |  |
Unvested shares |  | 770,714 |  | 1,156,078 |
Per share of unvested shares of common stock |  | $ 0.0001 |  |  |
Common stock, shares outstanding |  | 201,156,078 |  | 201,156,078 |
Preferred stock, shares issued |  | 0 |  | 0 |
Preferred stock, shares outstanding |  | 0 |  | 0 |
WMI Holdings Corp [Member] |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |
Common stock, shares issued |  | 200,000,000 |  |  |

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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