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RISKS AND UNCERTAINTIES (Details)	3 Months Ended
	Mar. 31, 2021
RISKS AND UNCERTAINTIES
Debt to adjusted EBITDA ratio	3.25

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- Definition

Adjusted ration of debt to earnings before interest, taxes, depreciation and amortization.

+ References

No definition available.

+ Details

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Namespace Prefix:	iii_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration