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Segment Reporting (Summary of Financial Information Concerning Company's Reportable Segments) (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
segment
Jun. 30, 2018
USD ($)
segment
Jun. 30, 2019
USD ($)
segment
Jun. 30, 2018
USD ($)
segment
Segment Reporting Information [Line Items]        
Revenue $ 1,369,639 $ 1,239,968 $ 2,614,275 $ 2,380,099
Segment EBITDA [1] 414,156 386,685 792,518 735,706
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue 1,575,428 1,417,946 2,992,043 2,714,369
Segment EBITDA 421,602 386,425 803,822 741,789
Intercompany Revenue [Member]        
Segment Reporting Information [Line Items]        
Revenue [2] (205,789) (177,978) (377,768) (334,270)
Eastern [Member]        
Segment Reporting Information [Line Items]        
Revenue 323,621 266,459 616,448 504,047
Segment EBITDA [1] 85,048 73,755 162,005 140,040
Eastern [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue 390,476 320,404 737,323 603,952
Eastern [Member] | Intercompany Revenue [Member]        
Segment Reporting Information [Line Items]        
Revenue [2] (66,855) (53,945) (120,875) (99,905)
Southern [Member]        
Segment Reporting Information [Line Items]        
Revenue 298,015 283,110 585,343 556,449
Segment EBITDA [1] 74,511 68,787 148,889 137,694
Southern [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue 339,461 321,051 663,942 630,007
Southern [Member] | Intercompany Revenue [Member]        
Segment Reporting Information [Line Items]        
Revenue [2] (41,446) (37,941) (78,599) (73,558)
Western [Member]        
Segment Reporting Information [Line Items]        
Revenue 276,998 263,699 531,977 508,862
Segment EBITDA [1] 86,440 81,175 163,444 153,832
Western [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue 311,702 295,730 597,877 570,850
Western [Member] | Intercompany Revenue [Member]        
Segment Reporting Information [Line Items]        
Revenue [2] (34,704) (32,031) (65,900) (61,988)
Central [Member]        
Segment Reporting Information [Line Items]        
Revenue 218,361 179,504 396,238 337,584
Segment EBITDA [1] 74,506 64,172 137,534 123,742
Central [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue 250,467 207,209 453,260 386,700
Central [Member] | Intercompany Revenue [Member]        
Segment Reporting Information [Line Items]        
Revenue [2] (32,106) (27,705) (57,022) (49,116)
Canada [Member]        
Segment Reporting Information [Line Items]        
Revenue 188,527 186,838 356,874 356,813
Segment EBITDA [1] 67,664 67,305 126,908 126,571
Canada [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue 216,306 211,787 406,591 403,475
Canada [Member] | Intercompany Revenue [Member]        
Segment Reporting Information [Line Items]        
Revenue [2] (27,779) (24,949) (49,717) (46,662)
Exploration and Production [Member]        
Segment Reporting Information [Line Items]        
Revenue 64,117 60,358 127,395 116,344
Segment EBITDA [1] 33,433 31,231 65,042 59,910
Exploration and Production [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue 67,016 61,765 133,050 119,385
Exploration and Production [Member] | Intercompany Revenue [Member]        
Segment Reporting Information [Line Items]        
Revenue [2] (2,899) (1,407) (5,655) (3,041)
Corporate [Member]        
Segment Reporting Information [Line Items]        
Revenue [3]      
Segment EBITDA [1],[3] $ (7,446) $ 260 $ (11,304) $ (6,083)
Number of operating segments | segment 6 6 6 6
Corporate [Member] | Operating 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.