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Income before provision for income taxes and losses on equity investment (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Domestic $ 12,513 $ 1,589 $ (5,196)
Foreign 6,404 7,373 8,840
Income before provision for income taxes and loss on equity investment $ 18,917 $ 8,962 $ 3,644