Common Stock Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands				1 Months Ended		3 Months Ended	12 Months Ended
	May 04, 2016	Apr. 28, 2015	Apr. 23, 2014	Feb. 28, 2018	Aug. 31, 2017	Jul. 23, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Apr. 28, 2016
Share Repurchases [Line Items]
Common stock repurchased and retired							$ 103,793,000	$ 96,218,000	$ 101,791,000
Additional Paid-in Capital
Share Repurchases [Line Items]
Common stock repurchased and retired							5,583,000	10,593,000	15,669,000
Retained Earnings
Share Repurchases [Line Items]
Common stock repurchased and retired							98,210,000	$ 85,625,000	$ 86,122,000
April 2014 Stock Repurchase Program
Share Repurchases [Line Items]
Repurchase of common stock, common stock authorized			$ 300,000,000
Repurchase period			3 years
Common stock repurchased and retired (shares)								500
Common stock repurchased (in dollars per share)								$ 58.89
Common stock repurchased and retired							$ 3,800,000	$ 31,800,000
Accelerated share repurchase agreement amount	$ 50,000,000	$ 70,000,000
Accelerated share repurchase (in shares)						1,200	40
Accelerated share repurchases price per share (in dollars per share)						$ 60.52	$ 96.37
April 2016 Stock Repurchase Program
Share Repurchases [Line Items]
Repurchase of common stock, common stock authorized										$ 300,000,000
Common stock repurchased and retired (shares)								500
Common stock repurchased (in dollars per share)								$ 92.58
Common stock repurchased and retired								$ 46,200,000
Accelerated share repurchase (in shares)								600
Accelerated share repurchases price per share (in dollars per share)								$ 81.89
2017 ASR
Share Repurchases [Line Items]
Common stock repurchased and retired (shares)					400		200
Common stock repurchased (in dollars per share)					$ 146.48		$ 243.40
Common stock repurchased and retired							$ 50,000,000
Authorized repurchase amount remaining							$ 200,000,000
Subsequent Event | 2017 ASR
Share Repurchases [Line Items]
Common stock repurchased and retired (shares)				400
Common stock repurchased and retired				$ 100,000,000
Accelerated share repurchases price per share (in dollars per share)				$ 252.24