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Business Combinations and Dispositions- Schedule of Calculation of Consideration Transferred (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | Jan. 01, 2021 | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Common stock, shares outstanding |  | 196,288 | 116,829
Common stock, shares issued |  | 196,288 | 116,829
BMC Stock Holdings, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Common stock, shares outstanding | 67,568 |  |
Exchange ratio for common shares outstanding per Merger Agreement | 1.3125% |  |
Common stock, shares issued | 88,683 |  |
Number of BMC stock awards that vested as a result of the BMC Merger | 688 |  |
Exchange ratio for stock awards expected to vest per Merger Agreement | 1.3125% |  |
Shares of BFS common stock issued for BMC vested restricted stock awards | 903 |  |
Fair value of BFS common stock issued for BMC outstanding common stock and vested equity awards | $ 3,655,988 |  |
Fair value of modified BMC fully vested, unexercised options | 2,374 |  |
Total consideration transferred | $ 3,658,362 |  |
BMC Stock Holdings, Inc. | BMC |  |  |
Business Acquisition [Line Items] |  |  |
Common stock price per share | $ 40.81 |  |

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