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Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 133,445	$ 18,803	$ 209,772	$ 69,985
Increase in income taxes	$ 114,600		$ 139,800
Effective tax rate	23.10%	18.60%	22.70%	21.50%
Federal statutory tax rate	21.00%		21.00%
Unrecognized tax benefits	$ 172,700		$ 172,700		$ 168,500
Increase in unrecognized tax benefits			4,200
Change in unrecognized tax benefits			9,900
Unrecognized tax benefits expiration of statute of limitations in various tax jurisdictions			$ 5,700

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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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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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