Other Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Schedule of Other Assets [Line Items]
Vendor and security deposits	$ 3,682		$ 3,774
Current tax receivable	6,762		6,762
Deferred tax assets	3,449		4,471
Investment in Kapitall, Inc.	500	[1]	500	[1]
Miscellaneous receivables	2,846		2,630
Other assets, net	$ 17,239		$ 18,137

[1] The cost method of accounting is used to account for the Company's investment in Kapitall, Inc., because the Company does not have the ability to exercise significant influence over Kapitall, Inc.'s operating and financial policies.