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Business Combination - Summary of Aggregate Preliminary Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 2,536,909 |  | $ 785,305
BMC Stock Holdings, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Cash and cash equivalents |  | $ 167,490 |
Accounts receivable |  | 469,204 |
Other receivables |  | 36,704 |
Inventories |  | 460,146 |
Other current assets |  | 32,891 |
Property, plant and equipment |  | 555,170 |
Operating lease right-of-use assets |  | 179,133 |
Goodwill |  | 1,751,604 |
Intangible assets |  | 1,470,000 |
Other assets |  | 6,244 |
Total assets |  | 5,128,586 |
Accounts payable |  | 279,980 |
Accrued liabilities |  | 246,119 |
Operating lease liabilities |  | 180,650 |
Long-term debt |  | 366,797 |
Deferred income taxes |  | 349,971 |
Other long-term liabilities |  | 46,707 |
Total liabilities |  | 1,470,224 |
Total consideration transferred |  | $ 3,658,362 |

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