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Segment Reporting (Reconciliation of Primary Measure of Segment Profitability to Income Before Income Tax Provision) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment EBITDA | [1] | $ 383,156 |  | $ 319,036 |  | $ 1,065,311 | $ 637,482 |
Depreciation |  | (136,941) |  | (125,744) |  | (395,008) | (270,988) |
Amortization of intangibles |  | (26,613) |  | (26,944) |  | (76,886) | (48,719) |
Impairments and other operating items |  | (832) |  | (7,682) |  | (141,333) | (4,634) |
Interest expense |  | (32,471) |  | (27,621) |  | (92,763) | (65,291) |
Interest income |  | 1,656 |  | 171 |  | 3,131 | 447 |
Other income (expense), net |  | 1,709 |  | 500 |  | 3,561 | (268) |
Foreign currency transaction gain (loss) |  | (1,864) |  | (350) |  | (3,502) | 339 |
Income before income tax provision |  | 187,800 |  | 131,366 |  | 362,511 | 248,368 |
Southern [Member] |  |  |  |  |  |  |  |
Segment EBITDA | [1] | 63,171 |  | 62,189 |  | 199,280 | 98,906 |
Western [Member] |  |  |  |  |  |  |  |
Segment EBITDA | [1] | 84,861 |  | 84,214 |  | 247,475 | 237,839 |
Eastern [Member] |  |  |  |  |  |  |  |
Segment EBITDA | [1] | 74,018 |  | 57,699 |  | 209,315 | 135,456 |
Canada [Member] |  |  |  |  |  |  |  |
Segment EBITDA | [1] | 74,369 |  | 66,235 |  | 200,283 | 91,471 |
Central [Member] |  |  |  |  |  |  |  |
Segment EBITDA | [1] | 64,607 | [2] | 58,079 | [2] | 177,975 | 154,510 |
Exploration and Production [Member] |  |  |  |  |  |  |  |
Segment EBITDA | [1] | 27,881 |  | 8,919 |  | 63,518 | 21,953 |
Corporate [Member] |  |  |  |  |  |  |  |
Segment EBITDA | [1] | (5,751) | [2] | (18,299) | [2] | (32,535) | (102,653) | [2]
Reportable Segments [Member] |  |  |  |  |  |  |  |
Segment EBITDA |  | $ 388,907 |  | $ 337,335 |  | $ 1,097,846 | $ 740,135 |
[1] | For those items included in the determination of segment EBITDA, the accounting policies of the segments are the same as those described in the Company's most recent Annual Report on Form 10-K.
[2] | Corporate functions include accounting, legal, tax, treasury, information technology, risk management, human resources, training and other administrative functions. Amounts reflected are net of allocations to the six operating segments.

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