Income Taxes - Income Tax Expense (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]
Current income tax expense (benefit)	$ 24,530	$ 14,505	$ 53,942	$ 29,504
Deferred income tax expense (benefit)	(25,844)	369	(51,933)	(675)
Income tax expense (benefit), as reported	$ (1,314)	$ 14,874	$ 2,009	$ 28,829
Effective tax rate	(1.40%)	11.80%	1.30%	11.20%