Stockholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 04, 2018
Equity Class Of Treasury Stock [Line Items]
Stock-based compensation expense	$ 8,700,000	$ 7,000,000.0
Additional common shares issued under deferred and stock compensation arrangements	410,105
Purchases, shares	501,735
Long Term Incentive Plan
Equity Class Of Treasury Stock [Line Items]
Purchases, shares	10,288
Common Stock Repurchase Plan
Equity Class Of Treasury Stock [Line Items]
Purchases, shares	491,447
Stock repurchase programs, remaining authorized amount	$ 507,200,000
Stock repurchase programs, authorized amount			$ 800,000,000.0