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Employee Incentive Plans (2007 Stock Incentive Plan, ROI Summary) (Details) | 3 Months Ended
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Mar. 31, 2021 shares
Stock Incentive Plan Granted Shares Adjustment | 5,290 |
2007 Stock Incentive Plan (Shares) |  |
Beginning Balance | 4,972,611 | [1]
Shares Cancelled | (12,345) |
Ending Balance | 4,960,266 |
[1] | Stock Incentive Plan number of granted restricted stock units related to 2020 was adjusted by 5,290 additional restricted stock units during the three months ended March 31, 2021.

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- Definition Shares granted, net of shares distributed and forfeited. + References No definition available. + Details
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Balance Type: | na
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- Definition Shares cancelled during the period. + References No definition available. + Details
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Namespace Prefix: | ibkr_
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Balance Type: | na
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- Definition Stock Incentive Plan Granted Shares Adjustment for prior year end + References No definition available. + Details
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Namespace Prefix: | ibkr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |