Stockholders' Equity - Additional Information (Detail) (USD $)	1 Months Ended			3 Months Ended								12 Months Ended			1 Months Ended		12 Months Ended																					12 Months Ended
	Jul. 31, 2013	Apr. 30, 2013	Feb. 28, 2013	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Employee Stock [Member] HoursPerWeek	Apr. 30, 2013 Minimum [Member]	Apr. 30, 2013 Maximum [Member]	Dec. 31, 2013 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2012 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2011 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2010 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2009 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2013 Stock Options [Member]	Dec. 31, 2012 Stock Options [Member]	Dec. 31, 2011 Stock Options [Member]	Dec. 31, 2013 Equity Plan [Member] Installment	Dec. 31, 2013 Equity Plan [Member] Restricted Stock Units (RSUs) [Member] Minimum [Member]	Dec. 31, 2013 Equity Plan [Member] Restricted Stock Units (RSUs) [Member] Maximum [Member]	Dec. 31, 2013 1996 Equity Plan [Member] Equity Plan [Member]	Dec. 31, 2012 1996 Equity Plan [Member] Equity Plan [Member]	Dec. 31, 2013 1996 Equity Plan [Member] Equity Plan [Member] Minimum [Member]	Dec. 31, 2013 1996 Equity Plan [Member] Equity Plan [Member] Maximum [Member]	Dec. 31, 2012 2006 Director Plan [Member] Equity Plan [Member]	Dec. 31, 2013 2006 Director Plan [Member] Equity Plan [Member]	Dec. 31, 2011 2006 Director Plan [Member] Equity Plan [Member]	Dec. 31, 2010 2006 Director Plan [Member] Equity Plan [Member]	Dec. 31, 2009 2006 Director Plan [Member] Equity Plan [Member]	Dec. 31, 2013 1996 Director [Member] Equity Plan [Member]	Dec. 31, 2013 2006 Equity Plan [Member] Equity Plan [Member]	Dec. 31, 2012 2006 Equity Plan [Member] Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares authorized				500,000				500,000				500,000	500,000
Preferred stock, par value				$ 0.01				$ 0.01				$ 0.01	$ 0.01
Authorized to purchase of common stock under the stock repurchase program												$ 385,000,000
Additional purchase of common stock	25,000,000		50,000,000
Cumulative repurchase of common stock				12,400,000								12,400,000
Aggregate cost of repurchase of common stock												329,100,000
Repurchase of self-tender		130,000,000
Common stock price per share															$ 32.00	$ 36.00
Increment in per share value		$ 0.25
Purchase of common stock		2,054,732
Purchase price of common stock		$ 36.00
Aggregate price of stock		74,000,000
Expenses related to tender offer		1,100,000
Tender offer expired date		May 01, 2013
Treasury stock, retired												11,700,000
Carrying value of retired stock												303,000,000
Dividend declared and paid per share				$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.14	$ 0.14	$ 0.14	$ 0.14
Annual dividend declared and paid per share				$ 0.60				$ 0.56				$ 0.60	$ 0.56
Aggregate dividend declared for the year												12,400,000	12,600,000
Future awards granted or issued under plans														300,000														0					0				0	1,900,000
Shares authorized														1,500,000														13,500,000					450,000						4,350,000
Shares returned																													2,500,000			80,000
Options vested period																										3 years	4 years			2 years	4 years							4 years
Option expiration period																												10 years										10 years
Voting rights to holder																												10.00%
Exercise price rate of fair value														85.00%														110.00%
Option Outstanding and vested				1,734,000				1,936,000				1,734,000	1,936,000															50,000					200,000				13,000
Repurchase of common stock by non- employee																																		6,000	12,000	12,500
Number of installments upon option vest																									4
Intrinsic value of options exercised																						6,100,000	3,500,000	4,100,000
Weighted average grant date fair value for RSUs granted												$ 34.58						$ 33.88	$ 33.15
Number of share receive on lapse and vesting condition met																	1
Value of RSUs vested and converted to common stock																	2,400,000	1,600,000
RSU's issued				372,000				301,000				372,000	301,000						71,000	63,000	95,496
Performance of RSU's vesting																			100% or 40% on April 1, 2014	100% or 40% on April 1, 2013	100% or 40% on April 1, 2012
Performance of outstanding RSU's																					40.00%
Compensation expense estimate vesting																	0.00%	0.00%	0.00%	100.00%	100.00%
Modified estimate vesting of RSU's																				0.00%	40.00%
Hours of work per week														20
Purchase periods under the stock purchase plan														6 months
Holding period of stocks under stock purchase plan														1 year
Payment for Common stock under the stock repurchase program														$ 12,500,000
Employee maximum elected percentage reduction of compensation to purchase shares														10.00%