Stockholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 04, 2018
Equity Class Of Treasury Stock [Line Items]
Stock-based compensation expense	$ 2,600,000	$ 2,500,000	$ 9,400,000	$ 8,200,000
Additional common shares issued under deferred and stock compensation arrangements			622,704
Long Term Incentive Plan
Equity Class Of Treasury Stock [Line Items]
Treasury stock purchases, shares			15,631
Common Stock Repurchase Plan
Equity Class Of Treasury Stock [Line Items]
Treasury stock purchases, shares			0
Stock repurchase programs, remaining authorized amount					$ 390,000,000.0
Stock repurchase programs, authorized amount					$ 500,000,000.0