Common Stock Repurchase Programs - Additional Information (Detail) (USD $) Share data in Thousands, unless otherwise specified	0 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended				0 Months Ended	12 Months Ended
	Nov. 06, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Aug. 31, 2012 Share Repurchase Program Two Thousand And Twelve [Member]	Dec. 31, 2013 Share Repurchase Program Two Thousand And Twelve [Member]	Dec. 31, 2012 Share Repurchase Program Two Thousand And Twelve [Member]	Dec. 31, 2013 Net Share Settlement [Member]	Dec. 31, 2012 Net Share Settlement [Member]	Nov. 06, 2013 Share Repurchase Program Two Thousand And Thirteen [Member]	Dec. 31, 2013 Share Repurchase Program Two Thousand And Thirteen [Member]
Stock Repurchase Program [Line Items]
Repurchase of common stock, authorized amount					$ 100,000,000					$ 200,000,000
Aggregate shares purchased						700	1,300	500	400		100
Aggregate purchase price		35,734,000	35,176,000	45,841,000		19,300,000	22,900,000				2,500,000
Authorized remaining amount of common stock canceled										58,000,000
Value of shares surrendered to satisfy tax withholding obligations								13,900,000	12,300,000
Retirement of treasury stock	34,000
Carrying value of treasury stock retired	$ 592,400,000