Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Taxes [Line Items]
Federal statutory tax rate			21.00%
Income tax expense	$ 11,075	$ 10,663	$ 22,129	$ 17,898
Effective tax rates on pre-tax income	16.42%	16.63%	16.34%	16.48%

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration