Income Taxes - Reconciliation of Income Tax Expense Computed by Applying the United States Federal Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]
Computed “expected” tax expense	$ 200,879	$ 167,117	$ 171,849
Increase (decrease) in income taxes resulting from:
Effect of foreign taxes	48,584	26,599	16,445
State income taxes, net of Federal income tax benefit	14,507	11,885	8,682
Nondeductible executive compensation	4,324	2,838	3,126
Stock compensation expense, net	(8,461)	(2,689)	(3,860)
Other, net	(1,483)	(1,972)	2,297
Income tax expense	$ 258,350	$ 203,778	$ 198,539