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Business Combination - Schedule of Calculation of Consideration Transferred (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
Jan. 01, 2021
Mar. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]      
Common stock, shares outstanding   206,858 116,829
Common stock, shares issued   206,858 116,829
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 equity awards 903    
Common stock price per share $ 40.81    
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