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Assets Held for Sale - Additional Information (Detail) $ in Thousands | 9 Months Ended
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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

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

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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 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

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- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAssetsHeldForSaleDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration