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Income Taxes - Components of Effective Tax Rate on Income (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Tax provision computed at the federal statutory income tax rate $ 16,047 $ 13,265 $ 20,103
State and local income taxes, net of federal tax benefits 2,091 1,440 1,401
Share-based compensation (1,790) (1,005) 1,656
Foreign exchange gain   724  
Deferred tax adjustment from TCJA (10,284) (7,491)  
162(m) limit on deductibility of executive compensation 1,547    
Other (1,296) 1,727 (326)
Total provision for income taxes $ 6,315 $ 8,660 $ 22,834
Effective tax rate 8.30% 22.90% 39.80%