XML 27 R39.htm IDEA: XBRL DOCUMENT
v3.19.3

Revenue Recognition - Schedule of Net Under (Over) Billings (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Contractors [Abstract] |  |
Costs and estimated earnings in excess of billings on uncompleted contracts (contract assets) | $ 22,278 | $ 15,092
Billings in excess of costs and estimated earnings on uncompleted contracts (contract liabilities) | (5,524) | (4,426)
Net under billings | $ 16,754 | $ 10,666

X
- Definition Billings In Excess Of Cost On Uncompleted Contracts + References No definition available. + Details
Name: | ibp_BillingsInExcessOfCostOnUncompletedContracts
Namespace Prefix: | ibp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Cost and estimated earnings under or over billings net. + References No definition available. + Details
Name: | ibp_CostAndEstimatedEarningsUnderOverBillingsNet
Namespace Prefix: | ibp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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