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Income Taxes - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Taxes [Line Items]        
Effective income tax rate 27.00% 27.50% 25.00% 27.40%
Minimum [Member]        
Income Taxes [Line Items]        
Reasonably possible decrease in unrecognized tax benefits $ 2,400,000   $ 2,400,000  
Maximum [Member]        
Income Taxes [Line Items]        
Reasonably possible decrease in unrecognized tax benefits $ 3,000,000.0   $ 3,000,000.0