Accounts Payable and Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accounts Payable and Accrued Liabilities [Line Items]
Accounts payable	$ 27,573	$ 17,791
Payroll, employee benefits, severance	66,110	62,882
Bonus payable	62,191	64,620
Commissions payable	42,328	41,503
Taxes payable	15,917	15,030
Rent and other facilities costs	5,046	7,108
Professional, consulting, audit fees	6,907	11,987
Events fulfillment liabilities	2,255	4,367
Other accrued liabilities	31,163	22,445
Total accounts payable and accrued liabilities	$ 259,490	$ 247,733