Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Provision of Income Taxes [Line Items]
Current	$ 170,700	$ (45,700)	$ 2,400
Deferred	62,700	30,700	(66,200)
Income taxes	233,435	(15,062)	(63,802)
Federal
Reconciliation of Provision of Income Taxes [Line Items]
Current	87,900	(83,300)	(41,300)
Deferred	62,900	29,900	(66,600)
Income taxes	150,800	(53,400)	(107,900)
State
Reconciliation of Provision of Income Taxes [Line Items]
Current	12,000	5,600	2,700
Deferred	500	900	600
Income taxes	12,500	6,500	3,300
Foreign
Reconciliation of Provision of Income Taxes [Line Items]
Current	70,800	32,000	41,000
Deferred	(700)	(100)	(200)
Income taxes	$ 70,100	$ 31,900	$ 40,800