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Subsequent events - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 9 Months Ended
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Oct. 26, 2020 | Oct. 13, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Subsequent Event [Line Items] |  |  |  |
Business combination total consideration transferred |  |  | $ 45,790 | $ 29,062
Subsequent Event [Member] | Insulation Contractors [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Business combination total consideration transferred |  | $ 18,100 |  |
Subsequent Event [Member] | Norkote Inc [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Business combination total consideration transferred | $ 9,000 |  |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

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- Details
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- Details
Name: | us-gaap_BusinessAcquisitionAxis=ibp_InsulationContractorsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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