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The Company and its Subsidiaries - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended
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Mar. 31, 2013 Operations | Dec. 31, 2012 | Dec. 31, 2012 First Lien Note [Member] | Jul. 17, 2012 PMI [Member] | Jul. 17, 2012 WMMRC [Member] | Mar. 31, 2013 WMMRC [Member] Insurers
Related Party Transaction [Line Items] |  |  |  |  |  |
Number of operations | 1 |  |  |  |  |
Number of primary mortgage insurers |  |  |  |  |  | 7
Loss from contract termination |  | $ 6.2 |  |  |  |
Amount paid by PMI |  |  |  | 49.0 | 30.7 |
Cash paid to stockholders |  |  | 25.0 |  |  |
Interest paid on Notes |  |  | 3.7 |  |  |
Principal payment on Notes |  |  | $ 21.3 |  |  |

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