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Intangible Assets Other Than Goodwill - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
Amortization expense $ 10.0 $ 10.5 $ 10.6