v3.25.2
Documentation and Entity Information - shares
6 Months Ended
Jun. 30, 2025
Aug. 06, 2025
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 001-33440  
Entity Registrant Name INTERACTIVE BROKERS GROUP, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 30-0390693  
Entity Address, Address Line One One Pickwick Plaza  
Entity Address, City or Town Greenwich  
Entity Address, State or Province CT  
Entity Address, Postal Zip Code 06830  
City Area Code 203  
Local Phone Number 618-5800  
Title of 12(b) Security Common Stock, par value $.01 per share  
Trading Symbol IBKR  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Current Fiscal Year End Date --12-31  
Fiscal Period Focus Q2  
Fiscal Year Focus 2025  
Entity Central Index Key 0001381197  
Amendment Flag false  
Common Class A [Member]    
Common Stock Shares Outstanding   445,246,976
Common Class B [Member]    
Common Stock Shares Outstanding   400