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Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 76,327	$ 51,182
Increase in income taxes due to decrease of pre-tax book income	$ 25,100
Effective tax rate	22.10%	22.80%
Federal statutory tax rate	21.00%
Unrecognized tax benefits	$ 166,800
Decrease in unrecognized tax benefits	1,700
Change in unrecognized tax benefits	3,100
Unrecognized tax benefits expiration of statute of limitations in various tax jurisdictions	$ 4,800

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