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Business Combination - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Jan. 01, 2021 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |  |
Net sales | $ 4,173,775 | $ 1,787,021 |  |
Income before income taxes | $ 216,112 | 9,016 |  |
Common stock, shares issued | 206,858 |  |  | 116,829
Common stock, shares outstanding | 206,858 |  |  | 116,829
BMC Stock Holdings, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Common stock price per share |  |  | $ 40.81 |
Common stock, shares issued |  |  | 88,683 |
Common stock, shares outstanding |  |  | 67,568 |
Preliminary fair value of intangible assets acquired |  |  | $ 1,470,000 |
Transaction related expenses assumed | $ 57,700 |  |  |
BMC Stock Holdings, Inc. | Level 3 | Customer Relationships |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Preliminary fair value of intangible assets acquired |  | $ 1,500,000 |  |
BMC Stock Holdings, Inc. | Merger Agreement |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger agreement date | Aug. 26, 2020 |  |  |
Net sales | $ 1,400,000 |  |  |
Income before income taxes | 42,800 |  |  |
Transaction related costs, incurred | 17,600 |  |  |
Common stock price per share |  |  |  | $ 40.81
Common stock, shares issued |  |  |  | 88,700
Common stock, shares outstanding |  |  |  | 900
Long-term debt, assumed | $ 359,800 |  |  |

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