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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, 2019
USD ($)
segment
Sep. 30, 2018
USD ($)
segment
Sep. 30, 2019
USD ($)
segment
Sep. 30, 2018
USD ($)
segment
Segment Reporting Information [Line Items]        
Revenue $ 1,412,444 $ 1,281,110 $ 4,026,719 $ 3,661,209
Segment EBITDA [1] 439,463 405,974 1,231,980 1,141,680
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue 1,622,544 1,471,286 4,614,587 4,185,656
Segment EBITDA 439,909 414,260 1,243,731 1,156,048
Intercompany Revenue [Member]        
Segment Reporting Information [Line Items]        
Revenue [2] (210,100) (190,176) (587,868) (524,447)
Eastern [Member]        
Segment Reporting Information [Line Items]        
Revenue 330,887 284,865 947,334 788,912
Segment EBITDA [1] 88,101 82,733 250,106 222,772
Eastern [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue 399,936 349,212 1,137,258 953,165
Eastern [Member] | Intercompany Revenue [Member]        
Segment Reporting Information [Line Items]        
Revenue [2] (69,049) (64,347) (189,924) (164,253)
Southern [Member]        
Segment Reporting Information [Line Items]        
Revenue 305,188 283,040 890,532 839,489
Segment EBITDA [1] 77,406 70,159 226,294 207,853
Southern [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue 347,630 321,306 1,011,572 951,313
Southern [Member] | Intercompany Revenue [Member]        
Segment Reporting Information [Line Items]        
Revenue [2] (42,442) (38,266) (121,040) (111,824)
Western [Member]        
Segment Reporting Information [Line Items]        
Revenue 289,208 271,018 821,185 779,880
Segment EBITDA [1] 90,059 86,174 253,504 240,006
Western [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue 324,859 303,614 922,737 874,464
Western [Member] | Intercompany Revenue [Member]        
Segment Reporting Information [Line Items]        
Revenue [2] (35,651) (32,596) (101,552) (94,584)
Central [Member]        
Segment Reporting Information [Line Items]        
Revenue 230,074 189,903 626,312 527,486
Segment EBITDA [1] 81,746 71,276 219,280 195,018
Central [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue 262,737 218,124 715,997 604,823
Central [Member] | Intercompany Revenue [Member]        
Segment Reporting Information [Line Items]        
Revenue [2] (32,663) (28,221) (89,685) (77,337)
Canada [Member]        
Segment Reporting Information [Line Items]        
Revenue 190,820 187,054 547,694 543,867
Segment EBITDA [1] 66,794 68,819 193,702 195,390
Canada [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue 217,879 211,682 624,470 615,157
Canada [Member] | Intercompany Revenue [Member]        
Segment Reporting Information [Line Items]        
Revenue [2] (27,059) (24,628) (76,776) (71,290)
Exploration and Production [Member]        
Segment Reporting Information [Line Items]        
Revenue 66,267 65,230 193,662 181,575
Segment EBITDA [1] 35,803 35,099 100,845 95,009
Exploration and Production [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue 69,503 67,348 202,553 186,734
Exploration and Production [Member] | Intercompany Revenue [Member]        
Segment Reporting Information [Line Items]        
Revenue [2] (3,236) (2,118) (8,891) (5,159)
Corporate [Member]        
Segment Reporting Information [Line Items]        
Revenue      
Segment EBITDA [1],[3] $ (446) $ (8,286) $ (11,751) $ (14,368)
Number of operating segments | segment 6 6 6 6
Corporate [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue      
Corporate [Member] | Intercompany Revenue [Member]        
Segment Reporting Information [Line Items]        
Revenue      
[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.