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Segment Reporting (Changes in Goodwill by Reportable Segment) (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | $ 4,390,261 | $ 1,422,825 | $ 1,422,825
Goodwill acquired | 309,031 | 2,931,223 |
Goodwill divested | (36,486) |  |
Impairment loss | (77,343) |  |
Goodwill adjustment for assets sold | 2,526 |  |
Goodwill adjustment for assets held for sale | (11,080) |  |
Impact of changes in foreign currency | 111,439 | (2,878) |
Goodwill, Ending Balance | 4,688,348 | 4,351,170 | 4,390,261
Southern [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 1,470,023 | 95,710 | 95,710
Goodwill acquired | 7,484 | 1,338,806 |
Goodwill divested | (31,543) |  |
Goodwill adjustment for assets sold | 2,205 |  |
Goodwill adjustment for assets held for sale | (11,080) |  |
Goodwill, Ending Balance | 1,437,089 | 1,434,516 | 1,470,023
Western [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 376,537 | 373,820 | 373,820
Goodwill acquired | 20,906 | 2,696 |
Goodwill, Ending Balance | 397,443 | 376,516 | 376,537
Eastern [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 533,160 | 459,532 | 459,532
Goodwill acquired | 272,501 | 75,769 |
Goodwill divested | (4,276) |  |
Goodwill adjustment for assets sold | 321 |  |
Goodwill, Ending Balance | 801,706 | 535,301 | 533,160
Canada [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 1,465,274 |  |
Goodwill acquired | 7,127 | 1,465,720 |
Impact of changes in foreign currency | 111,439 | (2,878) |
Goodwill, Ending Balance | 1,583,840 | 1,462,842 | 1,465,274
Central [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 467,924 | 416,420 | 416,420
Goodwill acquired | 1,013 | 48,232 |
Goodwill divested | (667) |  |
Goodwill, Ending Balance | 468,270 | 464,652 | 467,924
Exploration and Production [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 77,343 | 77,343 | 77,343
Impairment loss | $ (77,343) |  | 0
Goodwill, Ending Balance |  | $ 77,343 | $ 77,343

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