Shareholders' Equity - Additional Information (Detail) (USD $)	12 Months Ended						1 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2000 Stockholder Rights Plan	Apr. 30, 2010 Stockholder Rights Plan	Dec. 31, 2012 Maximum	Apr. 30, 2010 Maximum Stockholder Rights Plan	Apr. 30, 2010 Minimum Stockholder Rights Plan
Stockholders Equity Note [Line Items]
Maximum number of shares authorized to be repurchased						75,000,000
Shares remaining available for repurchases	1,981,000
Repurchase and retirement of common stock	$ 127,525,000	$ 132,372,000	$ 27,486,000
Repurchase and retirement of common stock, shares	1,649,000	2,608,000	1,202,000
Minimum percentage of the company's common stock that should be acquired for stock purchase rights to become exercisable				15.00%
Dividend of preferred stock purchase right				1
Dividend of preferred stock purchase right, date of record				Jun. 01, 2000
Purchase price for rights, per share							$ 125	$ 75
Redemption price per right					$ 0.01
Unrealized currency translation gain, net of tax	13,669,000	9,545,000
Unrealized currency translation gain, tax	1,698,000	1,516,000
Unrealized gains (losses) related to derivative instrument, net of tax benefit	(1,431,000)	2,478,000
Unrealized losses related to derivative instrument, net of tax expense (benefit)	$ (851,000)	$ 1,474,000
Common stock excluded from calculation of diluted earnings per share	872,000	131,000	788,000
Shares of common stock reserved for employee stock purchase plan	3,000,000
Percentage of average market price at which eligible employees are permitted to purchase common stock each month	95.00%
Shares purchased under employee stock purchase plan	1,220,000