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Restriction on Distribution of Net Assets from Subsidiary - Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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WMMRC [Member] |  |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |  |
Total net assets | $ 33.8 | $ 37.8 | $ 54.9

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