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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 49,062	$ 63,468		$ 119,047	$ 169,867
Decrease in income taxes due to decrease of pre-tax book income	$ 14,400			$ 50,900
Effective tax rate	21.00%	19.70%		21.30%	20.70%
Federal statutory tax rate	21.00%			21.00%
Unrecognized tax benefits	$ 142,200			$ 142,200
Increase in unrecognized tax benefits			$ 6,400	$ 1,000
Unrecognized tax benefits expiration of statute of limitations in various tax jurisdictions	$ 5,400

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

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

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