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Asset Impairment Charges - Additional information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Asset Impairment Charges [Line Items]      
Asset impairment charge $ 0 $ 0 $ 0
Waterloo [Member]      
Asset Impairment Charges [Line Items]      
Asset impairment charge     9,100,000
Fixed Assets     8,100,000
Definite-lived intangible assets     $ 1,000,000