Treasury Stock - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2019	Oct. 17, 2016
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, additional repurchase authorization		$ 300,000,000.0
Treasury stock (shares)	64,344,190
2016 BOD Authorized Common Stock Repurchase [Member]
Equity, Class of Treasury Stock [Line Items]
Payments for Repurchase of Common Stock	$ 12,100,000
Treasury Stock, Shares, Acquired (shares)	407,540
Remaining authorized repurchase amount	$ 112,500,000
Average cost per share of treasury stock acquired (usd per share)	$ 29.70
2004 Amended and Restated Stock Incentive Plan
Equity, Class of Treasury Stock [Line Items]
Treasury shares issued for restricted stock units that vested during the period (shares)	1,281,777
Average cost of treasury shares that were issued for restricted stock units that vested during the period (usd per share)	$ 2.86
Shares repurchased to satisfy minimum employee withholding tax requirements resulting from the vesting of such restricted stock units (shares)	535,527
Average cost per share of treasury stock acquired (usd per share)	$ 28.48