Employee Benefit Plans - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension and Other Postretirement Benefits Disclosure [Line Items]
Employees maximum 401(k) contribution, percentage	100.00%
Defined contribution plan, contribution	$ 2,800,000	$ 2,800,000	$ 2,900,000
Employer 401(k) matching contribution to employee, maximum percentage	4.00%
Employer 401(k) matching contribution to employee, maximum amount	4,000
Defined contribution plan, employer matching percentage on every deferred dollar	100.00%
Employees Under Age 50
Pension and Other Postretirement Benefits Disclosure [Line Items]
Employees maximum 401(k) contribution, amount	17,000
Employees aged 50 or older
Pension and Other Postretirement Benefits Disclosure [Line Items]
Employees maximum 401(k) contribution, amount	22,500
EMEA
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined contribution plan, contribution	$ 1,300,000	$ 1,300,000	$ 1,400,000
EMEA | Employed at December 1, 2000
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined contribution plan, employer contribution percentage of eligible compensation minimum	8.50%
EMEA | Employees aged over 55 years
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined contribution plan, employer contribution percentage of eligible compensation maximum	15.50%
EMEA | Employed subsequent to December 1, 2000
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined contribution plan, employer contribution percentage of eligible compensation	6.00%