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Income before provision for income taxes and losses on equity investment (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Domestic $ 18,931 $ 12,513 $ 1,589
Foreign 5,922 6,404 7,373
Income before provision for income taxes and loss on equity investments $ 24,853 $ 18,917 $ 8,962