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Income Taxes - Income Before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Domestic $ 22,303 $ 11,347 $ 12,939
Foreign 8,406 7,973 5,450
Income before income taxes $ 30,709 $ 19,320 $ 18,389