REGULATORY REQUIREMENTS (Details) In Thousands, unless otherwise specified	Dec. 31, 2012 GFI Securities LLC USD ($)	Dec. 31, 2012 GFI Brokers Limited USD ($)	Dec. 31, 2012 GFI Securities Limited USD ($)	Dec. 31, 2012 The Kyte Group Limited USD ($)	Dec. 31, 2012 Kyte Broking Limited USD ($)	Dec. 31, 2012 GFI (HK) Securities LLC USD ($)	Dec. 31, 2012 GFI (HK) Brokers Ltd USD ($)	Dec. 31, 2012 GFI (HK) Brokers Ltd HKD	Dec. 31, 2012 GFI Group Pte. Ltd USD ($)	Dec. 31, 2012 GFI Group Pte. Ltd SGD	Dec. 31, 2012 GFI Korea Money Brokerage Limited USD ($)	Dec. 31, 2012 GFI Korea Money Brokerage Limited KRW	Dec. 31, 2012 GFI Brokers LLC and Amerex Brokers LLC USD ($)
REGULATORY REQUIREMENTS
Regulatory capital	$ 12,476	$ 48,430	$ 59,758	$ 16,907	$ 6,088	$ 2,689	$ 4,811	37,291
Minimum regulatory capital required	250	41,383	59,338	11,053	2,457	387	645	5,000	2,464	3,000	4,700	5,000,000	45
Minimum regulatory capital required as a percent of aggregate debits	2.00%
Adjusted net capital for brokers													1,000
Adjusted net capital for brokers per office													6
Adjusted net capital for brokers per associated person													3
Excess regulatory capital	$ 12,226	$ 7,047	$ 420	$ 5,854	$ 3,631	$ 2,302	$ 4,166	32,291	$ 15,012	18,277	$ 5,270	5,606,378