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Stockholders' Equity - Additional Information (Detail)		3 Months Ended										12 Months Ended
Stockholders' Equity - Additional Information (Detail)	Apr. 03, 2013 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Sep. 30, 2015 $ / shares	Jun. 30, 2015 $ / shares	Mar. 31, 2015 $ / shares	Sep. 30, 2014 $ / shares	Jun. 30, 2014 $ / shares	Mar. 31, 2014 $ / shares	Sep. 30, 2013 $ / shares	Jun. 30, 2013 $ / shares	Mar. 31, 2013 $ / shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) Installment $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares	Dec. 31, 2012 shares	Jul. 31, 2015 USD ($)	Feb. 28, 2015 USD ($)	Dec. 31, 2011 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Preferred stock, shares authorized		500,000										500,000	500,000
Preferred stock, par value \| $ / shares		$ 0.01										$ 0.01	$ 0.01
Authorized to purchase of common stock under the stock repurchase program \| $		$ 460,000,000										$ 460,000,000				$ 25,000,000	$ 25,000,000
Cumulative repurchase of common stock		15,000,000										15,000,000
Aggregate cost of repurchase of common stock \| $												$ 423,100,000
Tender offer repurchase maximum \| $	$ 130,000,000
Tender offer increment in per share value \| $ / shares	$ 0.25
Tender Offer purchase of common stock	2,054,732
Tender offer purchase price of common stock per share \| $ / shares	$ 36.00
Tender offer shares aggregate purchase price \| $	$ 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 \| $ / shares		$ 0.17	$ 0.17	$ 0.17	$ 0.17	$ 0.16	$ 0.16	$ 0.16	$ 0.15	$ 0.15	$ 0.15		0.16	$ 0.15
Dividend declared per share \| $ / shares												$ 0.68	$ 0.64	$ 0.60
Aggregate dividend declared for the year \| $												$ 12,200,000	$ 12,000,000	$ 12,400,000
Option Outstanding and vested		2,171,000										2,171,000	1,954,000
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value for RSUs granted \| $ / shares												$ 31.50	$ 36.67	$ 34.58
Number of shares received per restricted stock unit on lapse of restrictions and vesting condition met												1
Value of RSUs vested and converted to common stock \| $												$ 4,600,000	$ 3,500,000	$ 2,400,000
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Intrinsic value of options exercised \| $												$ 400,000	$ 2,300,000	$ 6,100,000
Equity Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of common stock options entitlement of non- employee directors		12,000										12,000
Number of installments upon which share based awards vest \| Installment													4
1996 Equity Plan [Member] \| Equity Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Future awards granted or issued under plans		0										0
Shares authorized		13,500,000										13,500,000
Shares returned															2,500,000
Option expiration period												10 years
Percentage of voting rights that trigger ISO fair market value grant conditions												10.00%
Exercise price rate of fair value												110.00%
Option Outstanding and vested		8,500										8,500
2006 Director Plan [Member] \| Equity Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Future awards granted or issued under plans		0										0
Shares authorized		450,000										450,000
Shares returned															80,000
Option Outstanding and vested		200,000										200,000
Number of shares of common stock options entitlement of non- employee directors																		6,000
1996 Director [Member] \| Equity Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Future awards granted or issued under plans		0										0
Option Outstanding and vested		12,500										12,500
2006 Equity Plan [Member] \| Equity Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Future awards granted or issued under plans		800,000										800,000
2006 Plan expiration month and year												2016-05
Shares authorized															4,350,000
Option expiration period												10 years
2006 Equity Plan [Member] \| Equity Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options vested period												4 years
Prior to 2011 [Member] \| Equity Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of common stock options entitlement of non- employee directors		12,500										12,500
Employee Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Future awards granted or issued under plans		200,000										200,000
Shares authorized		700,000										700,000
Exercise price rate of fair value												85.00%
Hours of work per week												20 hours
Duration of purchase periods under employee stock purchase plan												6 months
Holding period of stocks acquired under employee stock purchase plan												1 year
Value used to derive maximum number of shares per participant for employee stock purchase \| $												$ 12,500
Employee maximum elected percentage reduction of compensation to purchase shares												10.00%
Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Tender offer authorized price per share \| $ / shares	$ 32.00
Minimum [Member] \| 1996 Equity Plan [Member] \| Equity Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options vested period												2 years
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Tender offer authorized price per share \| $ / shares	$ 36.00
Maximum [Member] \| 1996 Equity Plan [Member] \| Equity Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options vested period												4 years