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Telford Acquisition - Narrative (Details)
£ / shares in Units, $ in Thousands, £ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Oct. 01, 2019
USD ($)
Oct. 01, 2019
GBP (£)
£ / shares
Business Acquisition [Line Items]                          
Revenue $ 6,910,501 $ 5,645,142 $ 5,381,384 $ 5,889,168 $ 7,119,407 $ 5,925,101 $ 5,714,073 $ 5,135,510 $ 23,826,195 $ 23,894,091 $ 21,340,088    
Operating income $ 443,896 $ 211,408 $ 94,165 $ 220,290 $ 513,841 $ 316,630 $ 284,417 $ 144,987 969,759 1,259,875 1,087,989    
Operational net income                 969,969 1,361,345 1,379,006    
Direct transaction and integration costs                 $ 1,756 15,292 9,124    
Telford Homes                          
Business Acquisition [Line Items]                          
Share price | £ / shares                         £ 3,500
Business combination, cash consideration                       $ 328,500 £ 267.1
Revenue                   97,500      
Operating income                   1,000      
Operational net income                   1,400      
Direct transaction and integration costs                   15,000      
Increased amortization expense                   1,000 1,500    
Increased interest expense                     $ 4,100    
Removal of direct costs                   15,000      
Telford Homes | Trademark                          
Business Acquisition [Line Items]                          
Amortization expense                   $ 400