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Revenue Recognition - Schedule of Net Under (Over) Billings (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Revenue from Contract with Customer [Abstract] |  |
Costs and estimated earnings in excess of billings on uncompleted contracts (contract assets) | $ 34.4 | $ 33.2
Billings in excess of costs and estimated earnings on uncompleted contracts (contract liabilities) | (11.6) | (9.2)
Net under billings | $ 22.8 | $ 24.0

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- Definition Costs And Estimated Earnings In Excess Of Billing On Uncompleted Contracts + References No definition available. + Details
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Namespace Prefix: | ibp_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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