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Commitments and Contingencies - Additional Information (Detail) - USD ($)				12 Months Ended
	Jan. 05, 2018	Jul. 28, 2016	Jun. 16, 2016	Mar. 31, 2014	Dec. 31, 2017
Commitments And Contingencies [Line Items]
Letters of credit outstanding, amount					$ 9,400,000
Outstanding guarantees					0
Contingently liable for performance, current					$ 25,600,000
USG Corporation and United States Gypsum [Member]
Commitments And Contingencies [Line Items]
Litigation settlement amount				$ 48,000,000
Temple Inland Inc. [Member]
Commitments And Contingencies [Line Items]
Litigation settlement amount				$ 7,000,000
Lafarge North America [Member] | Direct Purchaser Class [Member]
Commitments And Contingencies [Line Items]
Litigation settlement amount			$ 23,000,000
Lafarge North America [Member] | Indirect Purchaser Class [Member]
Commitments And Contingencies [Line Items]
Litigation settlement amount		$ 5,200,000
American Gypsum Company LLC [Member] | Direct and Indirect Purchaser Class [Member] | Direct and Indirect Purchaser Settlement Agreements [Member] | Subsequent Event [Member]
Commitments And Contingencies [Line Items]
Litigation settlement amount	$ 39,100,000

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- Definition

Commitments and contingencies.

+ References

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- Definition

Contingent liability for performance bonds required by states municipalities and related agencies.

+ References

No definition available.

+ Details

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X

- Definition

This item represents a non-contingent liability for the fair value of an obligation to stand ready to perform over the term of a guaranty issued in the event that specified triggering events or conditions occur.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 25
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82913062&loc=d3e11049-110243

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.15)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 25
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=82913062&loc=d3e11019-110243

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- Definition

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+ References

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- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

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