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Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
Federal $ 5,641 $ 2,124 $ 5,136
State 1,777 1,347 (122)
Foreign 2,121 570 655
Deferred:      
Federal 650 160 (1,345)
State (365) 242 1,216
Foreign (679)    
Total income tax expense (benefit) $ 9,145 $ 4,443 $ 5,540