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Long-term Debt - Schedule of Debt (Parenthetical) (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Debt Instrument [Line Items]
Notes payable maturity date	2025-03
Minimum [Member]
Debt Instrument [Line Items]
Notes payable Interest rate	5.00%
Maximum [Member]
Debt Instrument [Line Items]
Notes payable Interest rate	6.00%
Term Loan Agreement [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ 1,509	$ 1,662
Vehicle and Equipment [Member]
Debt Instrument [Line Items]
Notes payable maturity date	2025-06
Vehicle and Equipment [Member] | Minimum [Member]
Debt Instrument [Line Items]
Notes payable Interest rate	2.10%
Vehicle and Equipment [Member] | Maximum [Member]
Debt Instrument [Line Items]
Notes payable Interest rate	4.80%
5.75% Senior Notes Due 2028 [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ 4,529	$ 4,823
Notes payable Interest rate			5.75%

X

- Definition

Debt instrument maturity month and year.

+ References

No definition available.

+ Details

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Namespace Prefix:	ibp_
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Balance Type:	na
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X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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Balance Type:	debit
Period Type:	instant

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- Details

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- Details

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