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Segment Reporting (Changes in Goodwill by Reportable Segment) (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Goodwill [Line Items]    
Goodwill, Beginning Balance $ 5,031,685 $ 4,681,774
Goodwill acquired 223,028 169,950
Goodwill acquisition adjustments   10,194
Goodwill divested (845)  
Impact of changes in foreign currency 43,688 (48,622)
Goodwill, Ending Balance 5,297,556 4,813,296
Eastern [Member]    
Goodwill [Line Items]    
Goodwill, Beginning Balance 1,143,355 804,133
Goodwill transferred (16,869) (16,869)
Goodwill acquired 22,146 122,136
Goodwill, Ending Balance 1,148,632 909,400
Southern [Member]    
Goodwill [Line Items]    
Goodwill, Beginning Balance 1,517,610 1,436,320
Goodwill acquired 10,329 4,800
Goodwill acquisition adjustments   10,194
Goodwill divested (845)  
Goodwill, Ending Balance 1,527,094 1,451,314
Western [Member]    
Goodwill [Line Items]    
Goodwill, Beginning Balance 398,174 397,508
Goodwill acquired 1,334 666
Goodwill, Ending Balance 399,508 398,174
Central [Member]    
Goodwill [Line Items]    
Goodwill, Beginning Balance 523,566 468,275
Goodwill transferred 16,869 16,869
Goodwill acquired 189,194 42,197
Goodwill, Ending Balance 729,629 527,341
Canada [Member]    
Goodwill [Line Items]    
Goodwill, Beginning Balance 1,448,980 1,575,538
Goodwill acquired 25 151
Impact of changes in foreign currency 43,688 (48,622)
Goodwill, Ending Balance $ 1,492,693 1,527,067
Exploration and Production [Member]    
Goodwill [Line Items]    
Goodwill, Beginning Balance  
Goodwill transferred  
Goodwill acquired  
Goodwill acquisition adjustments  
Impact of changes in foreign currency  
Goodwill, Ending Balance