Share-Based Compensation Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Payment Arrangement [Abstract]
Option awards	$ 5,900	$ 6,800	$ 9,600	$ 8,100
Other share-based awards	15,400	14,900	17,200	24,500
Total share-based compensation before tax	21,300	21,700	26,800	32,600
Tax benefit	5,100	5,200	6,400	7,800
Total share-based compensation expense included in net income (loss)	$ 16,200	$ 16,500	$ 20,400	$ 24,800