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Business Combinations and Dispositions - Pro Forma Operating Results (Detail) - BMC Stock Holdings, Inc. - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Business Acquisition [Line Items]
Net sales	$ 5,576,682	$ 2,925,539	$ 9,750,457	$ 5,633,439
Net income (loss)	$ 526,169	$ 70,147	$ 761,608	$ (16,514)

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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