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Subsequent Events - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 1 Months Ended
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Jul. 17, 2012 PMI [Member] | Jul. 17, 2012 WMMRC [Member] | Mar. 01, 2013 First Lien Note [Member] Subsequent Events [Member]
Subsequent Event [Line Items] |  |  |
Cash paid to stockholders |  |  | $ 25.0
Interest paid on Notes |  |  | 3.7
Principal payment on Notes |  |  | 21.3
Amount paid by PMI | $ 49.0 | $ 30.7 |

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