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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, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
segment
Sep. 30, 2016
USD ($)
Segment Reporting Information [Line Items]        
Revenue $ 1,206,478 $ 1,084,922 $ 3,473,313 $ 2,327,241
Segment EBITDA [1] 383,156 319,036 $ 1,065,311 637,482
Number of operating segments | segment     6  
Intercompany Revenue [Member]        
Segment Reporting Information [Line Items]        
Revenue [2] (165,512) (153,323) $ (483,998) (327,050)
Reportable Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue 1,371,990 1,238,245 3,957,311 2,654,291
Segment EBITDA 388,907 337,335 1,097,846 740,135
Southern [Member]        
Segment Reporting Information [Line Items]        
Revenue 280,528 279,909 846,034 437,378
Segment EBITDA [1] 63,171 62,189 199,280 98,906
Southern [Member] | Intercompany Revenue [Member]        
Segment Reporting Information [Line Items]        
Revenue [2] (36,531) (37,818) (111,472) (60,485)
Southern [Member] | Reportable Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue 317,059 317,727 957,506 497,863
Western [Member]        
Segment Reporting Information [Line Items]        
Revenue 261,877 246,891 754,959 702,556
Segment EBITDA [1] 84,861 84,214 247,475 237,839
Western [Member] | Intercompany Revenue [Member]        
Segment Reporting Information [Line Items]        
Revenue [2] (30,345) (30,050) (90,217) (87,160)
Western [Member] | Reportable Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue 292,222 276,941 845,176 789,716
Eastern [Member]        
Segment Reporting Information [Line Items]        
Revenue 246,267 191,979 718,302 437,804
Segment EBITDA [1] 74,018 57,699 209,315 135,456
Eastern [Member] | Intercompany Revenue [Member]        
Segment Reporting Information [Line Items]        
Revenue [2] (45,857) (34,701) (133,578) (81,361)
Eastern [Member] | Reportable Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue 292,124 226,680 851,880 519,165
Canada [Member]        
Segment Reporting Information [Line Items]        
Revenue 197,055 180,572 546,149 245,711
Segment EBITDA [1] 74,369 66,235 200,283 91,471
Canada [Member] | Intercompany Revenue [Member]        
Segment Reporting Information [Line Items]        
Revenue [2] (27,111) (26,431) (75,846) (35,949)
Canada [Member] | Reportable Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue 224,166 207,003 621,995 281,660
Central [Member]        
Segment Reporting Information [Line Items]        
Revenue 166,360 [3] 155,267 [3] 470,087 414,874
Segment EBITDA [1] 64,607 [3] 58,079 [3] 177,975 154,510
Central [Member] | Intercompany Revenue [Member]        
Segment Reporting Information [Line Items]        
Revenue [2] (23,850) [3] (20,842) [3] (66,716) (53,130)
Central [Member] | Reportable Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue 190,210 [3] 176,109 [3] 536,803 468,004
Exploration and Production [Member]        
Segment Reporting Information [Line Items]        
Revenue 54,391 30,304 137,782 88,918
Segment EBITDA [1] 27,881 8,919 63,518 21,953
Exploration and Production [Member] | Intercompany Revenue [Member]        
Segment Reporting Information [Line Items]        
Revenue [2] (1,818) (3,481) (6,169) (8,965)
Exploration and Production [Member] | Reportable Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue 56,209 33,785 143,951 97,883
Corporate [Member]        
Segment Reporting Information [Line Items]        
Revenue [3]      
Segment EBITDA [1] $ (5,751) [3] (18,299) [3] $ (32,535) $ (102,653) [3]
Corporate [Member] | Intercompany Revenue [Member]        
Segment Reporting Information [Line Items]        
Revenue [2],[3]      
Corporate [Member] | Reportable Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue [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.