Income Taxes - Income Tax Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Current income tax expense (benefit)	$ 14,065	$ 24,530	$ 17,790	$ 53,942
Deferred income tax expense (benefit)	1,016	(25,844)	5,188	(51,933)
Income tax expense, as reported	$ 15,081	$ (1,314)	$ 22,978	$ 2,009
Effective tax rate	11.30%	(1.40%)	8.90%	1.30%