Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Taxes [Line Items]
Federal statutory tax rate			21.00%
Income tax expense	$ 11,641	$ 10,335	$ 33,770	$ 28,233
Effective tax rates on pre-tax income	16.50%	16.35%	16.39%	16.43%