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Business Combinations and Dispositions - Pro Forma Operating Results (Detail) - BMC Stock Holdings, Inc. - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Business Acquisition [Line Items]        
Net sales $ 5,508,590 $ 3,385,793 $ 15,259,047 $ 9,019,232
Net income $ 642,048 $ 76,810 $ 1,401,823 $ 63,613