Stock-based Compensation Plans - Additional Information 3 (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation (income) expense	$ 9,322	$ 9,759	$ 28,697	$ 31,940
Performance-based PS-PSUs and RS-PSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period			3 years
Stock-based compensation (income) expense			$ (2,300)	2,300
Performance Based TSR - PSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period			3 years
Stock-based compensation expense			$ 1,900	$ 2,200