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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 18,803	$ 62,521	$ 69,985	$ 106,399
Decrease in income taxes due to decrease of pre-tax book income	$ 43,700		$ 36,400
Effective tax rate	18.60%	21.90%	21.50%	21.30%
Federal statutory tax rate			21.00%
Unrecognized tax benefits	$ 147,600		$ 147,600
Unrecognized tax benefits related to unsettled tax law	$ 6,400		$ 6,400

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