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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.