v2.4.0.6
Documentation and Entity Information
3 Months Ended
Mar. 31, 2013
May 08, 2013
Common Class A
May 08, 2013
Common Class B
Entity Registrant Name INTERACTIVE BROKERS GROUP, INC.    
Entity Central Index Key 0001381197    
Document Type 10-Q    
Document Period End Date Mar. 31, 2013    
Amendment Flag false    
Fiscal Year Focus 2013    
Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
Well Known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Common Stock Shares Outstanding   47,499,739 100