JUSTICE INVESTORS (Details Textual) (USD $)	0 Months Ended
Dec. 01, 2008
Justice Investors [Line Items]
Amendment To Limited Partnership Agreement Interests	98.00%
Minimum Future Amendment To Limited Partnership Agreement Interests	75.00%
Annual Revenues Of Partnership Percentage	1.50%
General Partner Contribution To Asset Managers	$ 75,000
Minimum Annual Compensation	$ 285,000
Portsmouth [Member]
Justice Investors [Line Items]
Allocated Compensation Percentage	80.00%
Allocated Excess Compensation Percentage	50.00%
Evon [Member]
Justice Investors [Line Items]
Allocated Compensation Percentage	20.00%
Allocated Excess Compensation Percentage	50.00%

Represents the income recognized during the period arising from equity-based compensation arrangements.

No definition available.

Name:	intg_AllocatedCompensationPercentage
Namespace Prefix:	intg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the excess income recognized during the period arising from equity-based compensation arrangements.

+ References

No definition available.

+ Details

Name:	intg_AllocatedExcessCompensationPercentage
Namespace Prefix:	intg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Reflects the amendment to the limited partnership agrrement interests in the reporting period.

+ References

No definition available.

+ Details

Name:	intg_AmendmentToLimitedPartnershipAgreementInterests
Namespace Prefix:	intg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Reflects the annual revenues of the partnership agreement in the reporting period.

+ References

No definition available.

+ Details

Name:	intg_AnnualRevenuesOfPartnershipPercentage
Namespace Prefix:	intg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

General partner contributed revenue to asset manager in the period for performance (incentive) fees based on the investment results achieved for management of certain institutional accounts and hedge funds.

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No definition available.

+ Details

Name:	intg_GeneralPartnerContributionToAssetManagers
Namespace Prefix:	intg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	intg_JusticeInvestorsLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Reflects the minimum base of annual compensation during the reporting period.

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No definition available.

+ Details

Name:	intg_MinimumAnnualCompensation
Namespace Prefix:	intg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Reflects the minimum future amendment to the limited partnership agrrement interests in the reporting period.

+ References

No definition available.

+ Details

Name:	intg_MinimumFutureAmendmentToLimitedPartnershipAgreementInterests
Namespace Prefix:	intg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant