Stockholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 04, 2018
Equity Class Of Treasury Stock [Line Items]
Stock-based compensation expense	$ 2,300,000	$ 2,000,000.0	$ 10,500,000	$ 12,800,000
Additional common shares issued under deferred and stock compensation arrangements			762,960
Treasury stock purchases, shares			701,555
Long Term Incentive Plan
Equity Class Of Treasury Stock [Line Items]
Treasury stock purchases, shares			15,547
Common Stock Repurchase Plan
Equity Class Of Treasury Stock [Line Items]
Treasury stock purchases, shares			686,008
Stock repurchase programs, remaining authorized amount					$ 390,000,000.0
Stock repurchase programs, authorized amount					$ 500,000,000.0