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Income Taxes - Income Before Income Taxes (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]                      
United States                 $ 4,774 $ 3,501 $ 4,421
Foreign                 21,032 17,452 7,285
INCOME BEFORE INCOME TAXES $ 7,691 $ 9,739 $ 6,258 $ 2,118 $ 6,990 $ 6,534 $ 3,773 $ 3,656 $ 25,806 $ 20,953 $ 11,706