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Employee Incentive Plans (2007 Stock Incentive Plan, ROI Summary) (Details) - 2007 Stock Incentive Plan (Shares)	9 Months Ended
	Sep. 30, 2019 shares	[1]
Beginning Balance	5,472,706
Shares Cancelled	(71,829)
Shares Distributed	(1,626,825)
Ending Balance	3,774,052
[1] Stock Incentive Plan number of granted restricted stock units related to 2018 was adjusted by 640 additional restricted stock units during the nine months ended September 30, 2019.

X

- Definition

Shares granted, net of shares distributed and forfeited.

+ References

No definition available.

+ Details

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Namespace Prefix:	ibkr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Total shares distributed during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	ibkr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Shares cancelled during the period.

+ References

No definition available.

+ Details

Name:	ibkr_SharesForfeited
Namespace Prefix:	ibkr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: