Corporate Restructuring and Other Organizational Changes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012		Sep. 30, 2012		Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Employee termination costs (adjustments)			$ 9,600,000
Employee termination cost paid during period			9,046,000
Number of positions eliminated			272
Unfavorable lease liability	518,000	[1]	518,000	[1]
Restructuring charges	4,485,000		4,485,000
Severance
Restructuring Cost and Reserve [Line Items]
Employee termination cost paid during period			7,905,000
Restructuring charges	1,652,000		1,652,000
Facility Closures
Restructuring Cost and Reserve [Line Items]
Employee termination cost paid during period			1,141,000
Lease termination fee	2,800,000
Unfavorable lease liability	518,000	[1]	518,000	[1]
Restructuring charges	2,833,000		2,833,000
Facility Closures | General and Administrative Expense
Restructuring Cost and Reserve [Line Items]
Lease termination fee	2,300,000
Lease for facility in New York
Restructuring Cost and Reserve [Line Items]
Lease termination fee	1,100,000
Americas
Restructuring Cost and Reserve [Line Items]
Employee termination costs (adjustments)			4,100,000
EMEA
Restructuring Cost and Reserve [Line Items]
Employee termination costs (adjustments)			4,600,000
Asia /Pacific
Restructuring Cost and Reserve [Line Items]
Employee termination costs (adjustments)			$ 900,000

[1] As a part of the S1 purchase price allocation, $0.5 million had been allocated to an unfavorable lease liability related to the Dublin facility.