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Income Taxes - Income Before Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
U.S. entities $ 26,552 $ 54,077 $ 27,400
International entities 18,135 (7,182) (1,692)
Income before provision for income taxes $ 44,687 $ 46,895 $ 25,708