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Assets Held for Sale - Additional Information (Detail) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 Property | Mar. 31, 2021 USD ($)
Long Lived Assets Held For Sale [Line Items] |  |
Number of properties | Property | 3 |
Irvine, California Property |  |
Long Lived Assets Held For Sale [Line Items] |  |
Proceeds from Sale of Property Held-for-sale | $ |  | $ 27,211

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- Definition Number of properties. + References No definition available. + Details
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Namespace Prefix: | nsit_
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Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- 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 http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585 + Details
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Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |