Derivative amortizing notional amount.

No definition available.

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Namespace Prefix:	ibp_
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- Definition

Number of derivative instruments amortized.

+ References

No definition available.

+ Details

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- Definition

Number of swaps.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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- Definition

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580

+ Details

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

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

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

+ Details

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

- Definition

Date the entity entered into the derivative contract, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- 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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- Definition

The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80845-113994

+ Details

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

- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

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- Details

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- Details

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Balance Type:
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- Details

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- Details

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- Details

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Derivative and Hedging Activities - Additional Information (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($) Instruments Swap	Dec. 31, 2017 USD ($) Instruments	Jan. 01, 2018 USD ($)
Term Loan [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of swaps \| Swap	3
Accounting Standards Update 2017-12 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Adjustment to retained earnings and accumulated other comprehensive income to reclassify cash flow hedge			$ 100,000
Designated as Hedging Instrument [Member] \| Term Loan [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Debt instrument, face amount	$ 200,000,000
Interest Expense [Member] \| Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Reclassification from accumulated other comprehensive income to interest expense	400,000
Interest Rate Swap [Member] \| Cash Flow Hedging [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount of derivative instruments	$ 200,000,000	$ 100,000,000
Derivatives, number of instruments held \| Instruments	2	1
Notional amount amortized		$ 95,300,000
Notional amount maturity date		May 31, 2022
Interest Rate Swap [Member] \| Cash Flow Hedging [Member] \| Interest Rate Swap Matured on May 31, 2022 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount amortized	$ 95,300,000
Notional amount maturity date	May 31, 2022
Derivatives, number of instruments amortized \| Instruments	1
Interest Rate Swap [Member] \| Cash Flow Hedging [Member] \| Interest Rate Swap Matured on April 15, 2025 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount amortized	$ 93,300,000
Notional amount maturity date	Apr. 15, 2025
Derivatives, number of instruments amortized \| Instruments	1
Forward Interest Rate Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount of derivative instruments	$ 100,000,000
Notional amount amortized	$ 97,000,000
Notional amount maturity date	Apr. 15, 2025
Notional amount beginning date	May 31, 2022