Share-Based Compensation Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Payment Arrangement [Abstract]
Option awards	$ 6,300	$ 7,000	$ 15,900	$ 15,100
Other share-based awards	17,600	12,700	34,800	37,200
Total share-based compensation before tax	23,900	19,700	50,700	52,300
Tax benefit	5,700	4,700	12,100	12,500
Total share-based compensation expense included in net income (loss)	$ 18,200	$ 15,000	$ 38,600	$ 39,800