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Segment Reporting (Changes in Goodwill by Reportable Segment) (Detail) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | $ 4,681,774 | $ 4,390,261
Goodwill acquired | 169,950 | 309,031
Goodwill divested |  | (36,486)
Impairment loss |  | (77,343)
Goodwill adjustment for assets sold |  | 2,526
Goodwill adjustment for assets held for sale | 10,194 | (11,080)
Impact of changes in foreign currency | (48,622) | 111,439
Goodwill, Ending Balance | 4,813,296 | 4,688,348
Southern [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 1,436,320 | 1,470,023
Goodwill acquired | 4,800 | 7,484
Goodwill divested |  | (31,543)
Goodwill adjustment for assets sold |  | 2,205
Goodwill adjustment for assets held for sale | 10,194 | (11,080)
Goodwill, Ending Balance | 1,451,314 | 1,437,089
Western [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 397,508 | 376,537
Goodwill acquired | 666 | 20,906
Goodwill, Ending Balance | 398,174 | 397,443
Eastern [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 804,133 | 533,160
Goodwill acquired | 122,136 | 272,501
Goodwill divested |  | (4,276)
Goodwill adjustment for assets sold |  | 321
Goodwill, Ending Balance | 926,269 | 801,706
Canada [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 1,575,538 | 1,465,274
Goodwill acquired | 151 | 7,127
Impact of changes in foreign currency | (48,622) | 111,439
Goodwill, Ending Balance | 1,527,067 | 1,583,840
Central [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 468,275 | 467,924
Goodwill acquired | 42,197 | 1,013
Goodwill divested |  | (667)
Goodwill, Ending Balance | $ 510,472 | 468,270
Exploration and Production [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance |  | 77,343
Goodwill acquired |  |
Goodwill divested |  |
Impairment loss |  | (77,343)
Goodwill adjustment for assets sold |  |
Goodwill adjustment for assets held for sale |  |
Impact of changes in foreign currency |  |
Goodwill, Ending Balance |  |

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