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Schedule of Components of Income Before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
U.S. $ 19,166 $ 51,145 $ 68,555
Foreign 53,441 61,901 69,309
Income before income taxes $ 72,607 $ 113,046 $ 137,864