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Document And Entity Information
Apr. 22, 2021
Document And Entity Information [Abstract]  
Document Type 8-K
Document Period End Date Apr. 22, 2021
Entity Registrant Name INTERACTIVE BROKERS GROUP, INC.
Entity Incorporation, State or Country Code DE
Entity File Number 001-33440
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
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, par value $.01 per share
Trading Symbol IBKR
Security Exchange Name NASDAQ
Entity Central Index Key 0001381197
Entity Emerging Growth Company false
Amendment Flag false