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Income Taxes - Summary of Provision for Income Taxes and Effective Tax Rate from Continuing Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Tax Disclosure [Abstract]    
Pretax income $ 21,382 $ 10,098
Provision for income taxes $ 3,498 $ 4,501
Effective rate 16.40% 44.60%