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Business Combinations and Dispositions- Additional Information (Detail) $ / shares in Units, shares in Thousands, $ in Thousands |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |
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Sep. 01, 2021 USD ($) | Aug. 17, 2021 USD ($) | Jul. 26, 2021 USD ($) | Jul. 01, 2021 USD ($) | May 03, 2021 USD ($) | Jan. 01, 2021 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) Segment shares | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) Segment shares | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) $ / shares shares
Business Combinations And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  | $ 5,508,590 | $ 2,295,450 | $ 15,259,047 | $ 6,028,114 |
Income before income taxes |  |  |  |  |  |  | $ 801,486 | $ 111,715 | $ 1,670,041 | $ 223,174 |
Fair value of intangible assets acquired | $ 1,771,550 |  |  |  |  |  |  |  |  |  |
Common stock, shares issued | shares |  |  |  |  |  |  | 196,288 |  | 196,288 |  | 116,829
Common stock, shares outstanding | shares |  |  |  |  |  |  | 196,288 |  | 196,288 |  | 116,829
Goodwill | 2,366,213 |  |  |  |  |  | $ 3,141,594 |  | $ 3,141,594 |  | $ 785,305
Number of reportable segment | Segment |  |  |  |  |  |  |  |  | 1 |  |
Eastern U.S. Gypsum Distribution Operations |  |  |  |  |  |  |  |  |  |  |
Business Combinations And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash proceeds |  |  | $ 76,200 |  |  |  |  |  |  |  |
Total gain on sale |  |  | $ 26,300 |  |  |  |  |  |  |  |
Number of reportable segment | Segment |  |  |  |  |  |  | 1 |  | 1 |  |
Customer Relationships |  |  |  |  |  |  |  |  |  |  |
Business Combinations And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of intangible assets acquired |  |  |  |  |  |  | $ 176,700 |  | $ 176,700 |  |
Transaction related costs, incurred |  |  |  |  |  |  | 6,500 |  | 7,200 |  |
John’s Lumber and Hardware Co |  |  |  |  |  |  |  |  |  |  |
Business Combinations And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase price of certain assets acquired |  |  |  |  | $ 24,800 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 8,400 |  | 8,400 |  |
John’s Lumber and Hardware Co | Customer Relationships |  |  |  |  |  |  |  |  |  |  |
Business Combinations And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of intangible assets acquired |  |  |  |  |  |  | 2,600 |  | 2,600 |  |
Cornerstone Building Alliance SW, LLC |  |  |  |  |  |  |  |  |  |  |
Business Combinations And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase price of certain assets, net of cash acquired |  |  |  | $ 408,900 |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 184,000 |  | 184,000 |  |
Cornerstone Building Alliance SW, LLC | Customer Relationships |  |  |  |  |  |  |  |  |  |  |
Business Combinations And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of intangible assets acquired |  |  |  |  |  |  | 108,200 |  | 108,200 |  |
CTF Holdings Limited Partnership |  |  |  |  |  |  |  |  |  |  |
Business Combinations And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase price of certain assets, net of cash acquired | $ 182,500 |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 98,100 |  | 98,100 |  |
CTF Holdings Limited Partnership | Customer Relationships |  |  |  |  |  |  |  |  |  |  |
Business Combinations And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of intangible assets acquired |  |  |  |  |  |  | 52,800 |  | 52,800 |  |
WTS Paradigm, LLC |  |  |  |  |  |  |  |  |  |  |
Business Combinations And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of intangible assets acquired |  | $ 124,900 |  |  |  |  |  |  |  |  |
Purchase price of certain assets, net of cash acquired |  | 449,400 |  |  |  |  |  |  |  |  |
Goodwill |  | 324,100 |  |  |  |  |  |  |  |  |
WTS Paradigm, LLC | Developed Technology |  |  |  |  |  |  |  |  |  |  |
Business Combinations And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of intangible assets acquired |  | $ 97,200 |  |  |  |  |  |  |  |  |
BMC Stock Holdings, Inc. |  |  |  |  |  |  |  |  |  |  |
Business Combinations And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of intangible assets acquired |  |  |  |  |  | $ 1,470,000 |  |  |  |  |
Common stock, shares issued | shares |  |  |  |  |  | 88,683 |  |  |  |  |
Common stock, shares outstanding | shares |  |  |  |  |  | 67,568 |  |  |  |  |
Purchase price of certain assets acquired |  |  |  |  |  | $ 3,658,362 |  |  |  |  |
Goodwill |  |  |  |  |  | $ 1,751,604 |  |  |  |  |
Transaction related expenses assumed |  |  |  |  |  |  |  |  | 57,700 |  |
BMC Stock Holdings, Inc. | BMC |  |  |  |  |  |  |  |  |  |  |
Business Combinations And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock price per share | $ / shares |  |  |  |  |  | $ 40.81 |  |  |  |  |
BMC Stock Holdings, Inc. | Merger Agreement |  |  |  |  |  |  |  |  |  |  |
Business Combinations And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  | 1,800,000 |  | 5,000,000 |  |
Income before income taxes |  |  |  |  |  |  | 196,900 |  | 418,400 |  |
Long-term debt, assumed |  |  |  |  |  |  | 359,800 |  | 359,800 |  |
Transaction related costs, incurred |  |  |  |  |  |  | 0 |  | 17,600 |  |
Common stock, shares issued | shares |  |  |  |  |  |  |  |  |  |  | 88,700
Common stock, shares outstanding | shares |  |  |  |  |  |  |  |  |  |  | 900
BMC Stock Holdings, Inc. | Merger Agreement | Customer Relationships |  |  |  |  |  |  |  |  |  |  |
Business Combinations And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of intangible assets acquired |  |  |  |  |  |  | $ 1,500,000 |  | $ 1,500,000 |  |
BMC Stock Holdings, Inc. | Merger Agreement | BMC |  |  |  |  |  |  |  |  |  |  |
Business Combinations And Dispositions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Merger agreement date |  |  |  |  |  |  |  |  | Aug. 26, 2020 |  |
Common stock price per share | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 40.81

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