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Income Taxes - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Income Tax [Line Items]          
Effective tax rate 23.80% 27.20% 23.80% 25.40%  
United States federal statutory income tax rate 21.00% 21.00% 21.00% 21.00%  
Unrecognized tax benefits $ 10,659,000   $ 10,659,000   $ 9,736,000
Unrecognized tax benefits, interest on income taxes accrued $ 610,000   $ 610,000   $ 442,000
Period during which examination phase of tax audits may conclude, description     Although the timing of the resolutions and/or closures of audits is highly uncertain, it is reasonably possible that the examination phase of these audits may be concluded within the next 12 months, which could increase or decrease the balance of our gross unrecognized tax benefits.    
Earliest Tax Year [Member]          
Income Tax [Line Items]          
Open tax year     2013    
Latest Tax Year [Member]          
Income Tax [Line Items]          
Open tax year     2018