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Commitments and Contingencies (Detail) - USD ($)		9 Months Ended
	Jul. 14, 2023	Sep. 30, 2023
Commitments And Contingencies [Line Items]
Minimum required purchase commitment amount		$ 100,467,000
Purchase commitment term		5 years
Software as a Service
Commitments And Contingencies [Line Items]
Minimum required purchase commitment amount		$ 40,000,000
Purchase commitment term		4 years
PCM Earnout Litigation
Commitments And Contingencies [Line Items]
Litigation settlement, amount awarded to other party	$ 10,550,000
Payment period	36 months
Surety Bond
Commitments And Contingencies [Line Items]
Performance bonds outstanding		$ 27,742,939
Minimum
Commitments And Contingencies [Line Items]
Number of months of salary paid as severance		3 months
Maximum
Commitments And Contingencies [Line Items]
Number of months of salary paid as severance		24 months

X

- Definition

Commitments and contingencies.

+ References

No definition available.

+ Details

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

X

- Definition

Loss Contingency, Litigation Segment, Payment Period

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

The number of months of salary that would be payable to certain officers and management teammates, if severance payments under current employment agreements or plan payments were to become payable.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

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

X

- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

+ Details

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

X

- Definition

Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

X

- Definition

The difference between the maximum amount of estimated loss and the amount recorded as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483076/450-20-50-4

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483076/450-20-50-9

+ Details

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Period Type:	instant

X

- Details

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Namespace Prefix:
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X

- Details

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- Details

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- Details

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- Details

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