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v3.19.3

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 |  |

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