Accelerated Share Repurchase Program- Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
	Mar. 16, 2016	Jul. 16, 2016	Jul. 16, 2016
Class Of Stock [Line Items]
Agreement to repurchase an aggregate of common stock			$ 126,298
Purchase of shares under accelerated share repurchase	5,600,000		6,892,194
Total ASR Cost
Class Of Stock [Line Items]
Agreement to repurchase an aggregate of common stock	$ 120,000
Purchase of shares under accelerated share repurchase		900,000
Original ASR Amount Settled
Class Of Stock [Line Items]
Agreement to repurchase an aggregate of common stock	$ 120,000
Authorized share repurchase plan
Class Of Stock [Line Items]
Agreement to repurchase an aggregate of common stock			$ 630,400
Purchase of shares under accelerated share repurchase			67,800,000