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DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS (Details)	Sep. 30, 2021 employee client country
Number of digital-ready professionals | employee	1,300
Minimum
Number of clients	700
Number of clients from top 100 enterprises in the markets	75
Number of countries | country	20

X

- Definition

Number of persons employed by the Entity

+ References

No definition available.

+ Details

Name:	dei_EntityNumberOfEmployees
Namespace Prefix:	dei_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the number of worldwide clients of the entity.

+ References

No definition available.

+ Details

Name:	iii_NumberOfClients
Namespace Prefix:	iii_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of clients from top 100 enterprises in the markets.

+ References

No definition available.

+ Details

Name:	iii_NumberOfClientsFromTop100Enterprises
Namespace Prefix:	iii_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of countries in which the entity operates as of balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfCountriesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: