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Earnings Before Income Taxes and Tax Provisions - (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income before income taxes:      
Domestic $ 1,258 $ 12,981 $ 25,508
Foreign 67,997 97,582 103,430
Earnings before income tax $ 69,255 $ 110,563 $ 128,938