Stock-based Compensation Plans - Additional Information 3 (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation (income) expense	$ 10,153,000	$ 11,016,000	$ 19,375,000	$ 22,181,000
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			$ (1.8)	1,700,000
Performance Based TSR - PSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period			3 years
Stock-based compensation expense			$ 1.5	$ 1,300,000