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Schedule of Components of Income Before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
U.S. $ (18,295) $ 18,814 $ 52,802
Foreign 38,777 52,660 62,131
Income before income taxes $ 20,482 $ 71,474 $ 114,933