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Restriction on Distribution of Net Assets from Subsidiary - Additional Information (Detail) (WMMRC [Member], USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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WMMRC [Member] |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |
Total net assets | $ 56.8 | $ 145.8

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