Accounts Payable, Accrued, and Other Liabilities (Detail) - Accounts Payable and Accrued Liabilities (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accounts payable	$ 27,344	$ 27,573
Payroll, employee benefits, severance	71,892	66,110
Bonus payable	68,776	62,191
Commissions payable	49,128	42,328
Taxes payable	18,897	15,917
Rent and other facilities costs	4,310	5,046
Professional, consulting, audit fees	8,355	6,907
Events fulfillment liabilities	4,209	2,255
Other accrued liabilities	34,852	31,163
Total accounts payable and accrued liabilities	$ 287,763	$ 259,490