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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Tax Contingency [Line Items]        
Valuation allowance $ 3,000   $ 3,000  
Income tax expense (benefit) $ 12,030 $ 14,413 $ 19,730 $ 24,828
Effective tax rate     22.70% 23.70%
Decrease in effective tax rate due to increase in domestic production activities deduction     1.00%  
Excess tax benefits from stock based awards     $ 2,600 $ 2,000
Earliest Tax Year [Member] | Federal Tax Jurisdiction [Member]        
Income Tax Contingency [Line Items]        
Tax years subject to examination     2015  
Latest Tax Year [Member] | Federal Tax Jurisdiction [Member]        
Income Tax Contingency [Line Items]        
Tax years subject to examination     2018