Segment Information - Intersegment Activity Eliminated in Arriving at Consolidated Totals was Included in "All Other" Category (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 5,991,772	$ 5,954,761	$ 6,191,943
Income taxes	596,403	416,369	618,112
Net income	1,858,746	1,353,152	1,929,149
Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Revenues	(55,556)	(47,604)	(48,559)
Expenses	(13,599)	(14,038)	(18,218)
Income taxes	(10,846)	(8,824)	(7,976)
Net income	$ (31,111)	$ (24,742)	$ (22,365)