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Segment Reporting (Reconciliation of Primary Measure of Segment Profitability to Income Before Income Tax Provision) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment EBITDA [1] $ 383,156 $ 319,036 $ 1,065,311 $ 637,482
Depreciation (136,941) (125,744) (395,008) (270,988)
Amortization of intangibles (26,613) (26,944) (76,886) (48,719)
Impairments and other operating items (832) (7,682) (141,333) (4,634)
Interest expense (32,471) (27,621) (92,763) (65,291)
Interest income 1,656 171 3,131 447
Other income (expense), net 1,709 500 3,561 (268)
Foreign currency transaction gain (loss) (1,864) (350) (3,502) 339
Income before income tax provision 187,800 131,366 362,511 248,368
Southern [Member]        
Segment EBITDA [1] 63,171 62,189 199,280 98,906
Western [Member]        
Segment EBITDA [1] 84,861 84,214 247,475 237,839
Eastern [Member]        
Segment EBITDA [1] 74,018 57,699 209,315 135,456
Canada [Member]        
Segment EBITDA [1] 74,369 66,235 200,283 91,471
Central [Member]        
Segment EBITDA [1] 64,607 [2] 58,079 [2] 177,975 154,510
Exploration and Production [Member]        
Segment EBITDA [1] 27,881 8,919 63,518 21,953
Corporate [Member]        
Segment EBITDA [1] (5,751) [2] (18,299) [2] (32,535) (102,653) [2]
Reportable Segments [Member]        
Segment EBITDA $ 388,907 $ 337,335 $ 1,097,846 $ 740,135
[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] 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.