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Segment Reporting (Summary of Financial Information Concerning Company's Reportable Segments) (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) segment | Sep. 30, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | $ 1,281,110 |  | $ 1,206,478 |  | $ 3,661,209 | $ 3,473,313
Segment EBITDA |  | 405,974 | [1] | 383,156 | [1] | $ 1,141,680 | 1,065,311
Number of operating segments | segment |  |  |  |  |  | 6 |
Reportable Segments [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 1,471,286 |  | 1,371,990 |  | $ 4,185,656 | 3,957,311
Segment EBITDA |  | 414,260 |  | 388,907 |  | 1,156,048 | 1,097,846
Intercompany Revenue [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | (190,176) | [2] | (165,512) | [2] | (524,447) | (483,998)
Southern [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 283,040 |  | 280,528 |  | 839,489 | 846,034
Segment EBITDA |  | 70,159 | [1] | 63,171 | [1] | 207,853 | 199,280
Southern [Member] | Reportable Segments [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 321,306 |  | 317,059 |  | 951,313 | 957,506
Southern [Member] | Intercompany Revenue [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | (38,266) | [2] | (36,531) | [2] | (111,824) | (111,472)
Western [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 271,018 |  | 261,877 |  | 779,880 | 754,959
Segment EBITDA |  | 86,174 | [1] | 84,861 | [1] | 240,006 | 247,475
Western [Member] | Reportable Segments [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 303,614 |  | 292,222 |  | 874,464 | 845,176
Western [Member] | Intercompany Revenue [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | (32,596) | [2] | (30,345) | [2] | (94,584) | (90,217)
Eastern [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 289,497 |  | 246,267 |  | 802,318 | 718,302
Segment EBITDA |  | 83,721 | [1] | 74,018 | [1] | 225,950 | 209,315
Eastern [Member] | Reportable Segments [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 353,844 |  | 292,124 |  | 966,571 | 851,880
Eastern [Member] | Intercompany Revenue [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | (64,347) | [2] | (45,857) | [2] | (164,253) | (133,578)
Canada [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 187,054 |  | 197,055 |  | 543,867 | 546,149
Segment EBITDA |  | 68,819 | [1] | 74,369 | [1] | 195,390 | 200,283
Canada [Member] | Reportable Segments [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 211,682 |  | 224,166 |  | 615,157 | 621,995
Canada [Member] | Intercompany Revenue [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | (24,628) | [2] | (27,111) | [2] | (71,290) | (75,846)
Central [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 185,271 | [3] | 166,360 | [3] | 514,080 | 470,087
Segment EBITDA |  | 70,288 | [1],[3] | 64,607 | [1],[3] | 191,840 | 177,975
Central [Member] | Reportable Segments [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 213,492 | [3] | 190,210 | [3] | 591,417 | 536,803
Central [Member] | Intercompany Revenue [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | (28,221) | [2],[3] | (23,850) | [2],[3] | (77,337) | (66,716)
Exploration and Production [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 65,230 |  | 54,391 |  | 181,575 | 137,782
Segment EBITDA |  | 35,099 | [1] | 27,881 | [1] | 95,009 | 63,518
Exploration and Production [Member] | Reportable Segments [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | 67,348 |  | 56,209 |  | 186,734 | 143,951
Exploration and Production [Member] | Intercompany Revenue [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue |  | (2,118) | [2] | (1,818) | [2] | (5,159) | (6,169)
Corporate [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue | [3] |  |  |  |  |  |
Segment EBITDA |  | $ (8,286) | [1],[3] | (5,751) | [1],[3] | $ (14,368) | $ (32,535)
Corporate [Member] | Reportable Segments [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue | [3] |  |  |  |  |  |
Corporate [Member] | Intercompany Revenue [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenue | [2],[3] |  |  |  |  |  |
[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] | Intercompany revenues reflect each segment's total intercompany sales, including intercompany sales within a segment and between segments. Transactions within and between segments are generally made on a basis intended to reflect the market value of the service.
[3] | 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.

X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Segment Reporting Information EBITDA, which the Company defines as earnings before interest, taxes, depreciation, amortization, impairments and other operating items, other income (expense) and foreign currency transaction gain (loss). + References No definition available. + Details
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