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Business Combinations and Dispositions- Additional Information (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jul. 26, 2021
USD ($)
Jun. 28, 2021
USD ($)
May 03, 2021
USD ($)
Jan. 01, 2021
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
Segment
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Segment
shares
Jun. 30, 2020
USD ($)
Dec. 31, 2020
$ / shares
shares
Business Combinations And Dispositions [Line Items]                  
Net sales         $ 5,576,682 $ 1,945,643 $ 9,750,457 $ 3,732,664  
Income before income taxes         $ 652,443 $ 102,443 $ 868,555 111,459  
Fair value of intangible assets acquired   $ 1,472,550              
Common stock, shares issued | shares         207,196   207,196   116,829
Common stock, shares outstanding | shares         207,196   207,196   116,829
Number of reportable segment | Segment             1    
Eastern U.S. Gypsum Distribution Operations                  
Business Combinations And Dispositions [Line Items]                  
Number of reportable segment | Segment         1   1    
Eastern U.S. Gypsum Distribution Operations | Subsequent Event                  
Business Combinations And Dispositions [Line Items]                  
Cash proceeds $ 76,000                
John’s Lumber and Hardware Co                  
Business Combinations And Dispositions [Line Items]                  
Cash consideration for certain assets acquired     $ 24,800            
WTS Paradigm, LLC                  
Business Combinations And Dispositions [Line Items]                  
Purchase price   450,000              
WTS Paradigm, LLC | Other Current Assets                  
Business Combinations And Dispositions [Line Items]                  
Cash consideration for certain assets acquired   $ 225,000              
Customer Relationships | John’s Lumber and Hardware Co                  
Business Combinations And Dispositions [Line Items]                  
Fair value of intangible assets acquired     $ 2,600            
BMC Stock Holdings, Inc.                  
Business Combinations And Dispositions [Line Items]                  
Fair value of intangible assets acquired       $ 1,470,000          
Common stock price per share | $ / shares       $ 40.81          
Common stock, shares issued | shares       88,683          
Common stock, shares outstanding | shares       67,568          
Cash consideration for certain assets acquired       $ 3,658,362          
Transaction related expenses assumed               $ 57,700  
BMC Stock Holdings, Inc. | Merger Agreement                  
Business Combinations And Dispositions [Line Items]                  
Merger agreement date             Aug. 26, 2020    
Net sales         $ 1,800,000   $ 3,200,000    
Income before income taxes         179,600   223,100    
Long-term debt, assumed         359,800   359,800    
Transaction related costs, incurred         0   17,600    
Common stock price per share | $ / shares                 $ 40.81
Common stock, shares issued | shares                 88,700
Common stock, shares outstanding | shares                 900
BMC Stock Holdings, Inc. | Merger Agreement | Customer Relationships                  
Business Combinations And Dispositions [Line Items]                  
Fair value of intangible assets acquired         $ 1,500,000   $ 1,500,000