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Assets Held for Sale - Additional Information (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($) property
Property, Plant and Equipment Assets Held-for-sale Disclosure [Abstract]
Number of properties | property	3
Proceeds from sale of property held-for-sale | $	$ 27,211

X

- Definition

Number of properties.

+ References

No definition available.

+ Details

Name:	nsit_NumberOfProperties
Namespace Prefix:	nsit_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cash inflow from the sale of formerly productive land held for sale, anything permanently fixed to it, including buildings, structures on it, and so forth.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromSaleOfPropertyHeldForSale
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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