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Receivables, Contract Liabilities and Performance Obligations - Summary of Changes in Contract Liabilities from Contract with Customers (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Contract with Customer, Contract Asset, Contract Liability, and Receivable Increase (Decrease) [Roll Forward]
Beginning balance	$ 102,057
Reclassification of the beginning contract liabilities to revenue, as the result of performance obligations satisfied	(56,429)
Cash received in advance and not recognized as revenue	63,714
Ending balance	$ 109,342

X

- Definition

Contract with Customer, Contract Asset, Contract Liability, and Receivable Increase (Decrease)

+ References

No definition available.

+ Details

Name:	nsit_ContractWithCustomerContractAssetContractLiabilityAndReceivableIncreaseDecreaseRollForward
Namespace Prefix:	nsit_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Contract with customer, liability, cash received in advance and not recognized as revenue.

+ References

No definition available.

+ Details

Name:	nsit_ContractWithCustomerLiabilityCashReceivedInAdvanceAndNotRecognizedAsRevenue
Namespace Prefix:	nsit_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479837/606-10-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-8

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479837/606-10-45-2

+ Details

Name:	us-gaap_ContractWithCustomerLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of revenue recognized arising from contract liability from change in timeframe for performance obligation to be satisfied.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-10

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration