Stockholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 04, 2018
Equity Class Of Treasury Stock [Line Items]
Stock-based compensation expense	$ 2,000,000.0	$ 2,100,000	$ 12,800,000	$ 11,100,000
Additional common shares issued under deferred and stock compensation arrangements			799,483
Treasury stock purchases, shares			1,681,534
Long Term Incentive Plan
Equity Class Of Treasury Stock [Line Items]
Treasury stock purchases, shares			12,589
Common Stock Repurchase Plan
Equity Class Of Treasury Stock [Line Items]
Treasury stock purchases, shares			1,668,945
Stock repurchase programs, remaining authorized amount					$ 430,500,000
Stock repurchase programs, authorized amount					$ 500,000,000.0