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Supplemental Cash Flow Disclosures - Cash Paid for Interest and Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Supplemental Cash Flow Elements [Abstract]      
Interest $ 6,117 $ 6,019 $ 7,986
Income taxes $ 25,085 $ 19,314 $ 23,558