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IBG LLC Ownership of Member Interests (Table) (Details)	Sep. 30, 2016 shares
IBG Inc [Member]
Ownership Percentage	16.60%
Membership Interests	67,987,957
Holdings [Member]
Ownership Percentage	83.40%
Membership Interests	341,444,304

X

- Definition

The amount of membership interests in IBG LLC

+ References

No definition available.

+ Details

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

X

- Definition

The percent of ownership in IBG LLC membership interests

+ References

No definition available.

+ Details

Name:	ibkr_OwnershipPercentage
Namespace Prefix:	ibkr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	ibkr_IbgOwnershipAxis=ibkr_IbgIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ibkr_IbgOwnershipAxis=ibkr_HoldingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: