Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax [Line Items]
Effective tax rate	16.20%	21.60%	14.80%	17.20%
Income tax expense (benefit)	$ 43,387	$ 53,894	$ 108,091	$ 117,255
Excess tax benefit recognized	$ 27,604	$ 12,585	$ 86,809	$ 58,607