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Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Finite Lived Intangible Assets [Line Items] |  |  |  |
Amortization Expenses | $ 92.3 | $ 5.4 | $ 261.6 | $ 16.7
Eastern U.S. Gypsum Distribution Operations |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets, net derecognized |  |  | 0.5 |
BMC Merger and Current Year Acquisitions |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets in connection with acquisition | 1,800.0 |  | $ 1,800.0 |
Weighted average useful lives of the acquired intangible assets |  |  | 11 years 1 month 6 days |
BMC Merger and Current Year Acquisitions | Customer Relationships |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets in connection with acquisition | 1,500.0 |  | $ 1,500.0 |
Weighted average useful lives of the acquired intangible assets |  |  | 11 years 3 months 18 days |
BMC Merger and Current Year Acquisitions | Trade Names |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets in connection with acquisition | 149.8 |  | $ 149.8 |
Weighted average useful lives of the acquired intangible assets |  |  | 7 years |
BMC Merger and Current Year Acquisitions | Developed Technology |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets in connection with acquisition | 97.2 |  | $ 97.2 |
Weighted average useful lives of the acquired intangible assets |  |  | 9 years |
BMC Merger and Current Year Acquisitions | Non-compete Agreements |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets in connection with acquisition | $ 9.8 |  | $ 9.8 |
Weighted average useful lives of the acquired intangible assets |  |  | 5 years 8 months 12 days |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=123455525&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
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