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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment EBITDA | $ 405,974 | [1] | $ 383,156 | [1] | $ 1,141,680 | $ 1,065,311
Depreciation | (148,232) |  | (136,941) |  | (423,866) | (395,008)
Amortization of intangibles | (26,871) |  | (26,613) |  | (79,444) | (76,886)
Impairments and other operating items | 1,998 |  | (832) |  | (6,106) | (141,333)
Interest expense | (32,078) |  | (32,471) |  | (96,874) | (92,763)
Interest income | 1,467 |  | 1,656 |  | 3,677 | 3,131
Other income, net | 732 |  | 1,709 |  | 2,376 | 3,561
Foreign currency transaction gain (loss) | (132) |  | (1,864) |  | (323) | (3,502)
Income before income tax provision | 202,858 |  | 187,800 |  | 541,120 | 362,511
Southern [Member] |  |  |  |  |  |
Segment EBITDA | 70,159 | [1] | 63,171 | [1] | 207,853 | 199,280
Western [Member] |  |  |  |  |  |
Segment EBITDA | 86,174 | [1] | 84,861 | [1] | 240,006 | 247,475
Eastern [Member] |  |  |  |  |  |
Segment EBITDA | 83,721 | [1] | 74,018 | [1] | 225,950 | 209,315
Canada [Member] |  |  |  |  |  |
Segment EBITDA | 68,819 | [1] | 74,369 | [1] | 195,390 | 200,283
Central [Member] |  |  |  |  |  |
Segment EBITDA | 70,288 | [1],[2] | 64,607 | [1],[2] | 191,840 | 177,975
Exploration and Production [Member] |  |  |  |  |  |
Segment EBITDA | 35,099 | [1] | 27,881 | [1] | 95,009 | 63,518
Corporate [Member] |  |  |  |  |  |
Segment EBITDA | (8,286) | [1],[2] | (5,751) | [1],[2] | (14,368) | (32,535)
Reportable Segments [Member] |  |  |  |  |  |
Segment EBITDA | $ 414,260 |  | $ 388,907 |  | $ 1,156,048 | $ 1,097,846
[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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