Leases - Schedule Of Supplemental Balance Sheet In formation Related To Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Non-Current
Operating	$ 50,873	$ 45,691
Finance	5,598	7,148
Total lease assets	56,471	52,839
Current
Less: Current obligation under leases	17,875	15,459
Financing	2,268	2,747
Non-Current
Long-term lease obligations	32,431	29,785
Financing	2,747	3,597
Total lease liabilities	$ 55,321	$ 51,588
Weighted-average remaining lease term
Operating leases	4 years 2 months 12 days
Finance leases	2 years 8 months 12 days
Weighted-average discount rate
Operating leases	3.91%
Finance leases	5.02%

Represents current lease liabilities abstract.

No definition available.

Name:	ibp_CurrentLeaseLiabilitiesAbstract
Namespace Prefix:	ibp_
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Balance Type:	na
Period Type:	duration

- Definition

Represents aggregate of operating and finance lease assets.

+ References

No definition available.

+ Details

Name:	ibp_LeaseAssets
Namespace Prefix:	ibp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents total lease liabilities.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents Operating and fianance lease right of use assets abstract.

+ References

No definition available.

+ Details

Name:	ibp_NonCurrentLeaseAssetsAbstract
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- Definition

Represents non-current lease liabilities abstract.

+ References

No definition available.

+ Details

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- Definition

Represents weighted average discount rate of operating finance leases abstract.

+ References

No definition available.

+ Details

Name:	ibp_WeightedAverageDiscountRateOfOperatingFinanceLeasesAbstract
Namespace Prefix:	ibp_
Data Type:	xbrli:stringItemType
Balance Type:	na
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- Definition

Represents weighted average remaining lease term of operating finance leases abstract.

+ References

No definition available.

+ Details

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Namespace Prefix:	ibp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after accumulated amortization, of right-of-use asset from finance lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted average discount rate for finance lease calculated at point in time.

+ References

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-Publisher FASB
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- Definition

Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
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- Definition

Weighted average discount rate for operating lease calculated at point in time.

+ References

+ Details

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- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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