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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment EBITDA [1] $ 439,463 $ 405,974 $ 1,231,980 $ 1,141,680
Depreciation (157,994) (148,232) (461,616) (423,866)
Amortization of intangibles (31,934) (26,871) (93,821) (79,444)
Impairments and other operating items (12,935) 1,998 (32,949) (6,106)
Interest expense (36,780) (32,078) (111,313) (96,874)
Interest income 2,056 1,467 7,186 3,677
Other income (expense), net (19) 600 4,562 2,053
Income before income tax provision 201,857 202,858 544,029 541,120
Eastern [Member]        
Segment EBITDA [1] 88,101 82,733 250,106 222,772
Southern [Member]        
Segment EBITDA [1] 77,406 70,159 226,294 207,853
Western [Member]        
Segment EBITDA [1] 90,059 86,174 253,504 240,006
Central [Member]        
Segment EBITDA [1] 81,746 71,276 219,280 195,018
Canada [Member]        
Segment EBITDA [1] 66,794 68,819 193,702 195,390
Exploration and Production [Member]        
Segment EBITDA [1] 35,803 35,099 100,845 95,009
Corporate [Member]        
Segment EBITDA [1],[2] (446) (8,286) (11,751) (14,368)
Operating Segments [Member]        
Segment EBITDA $ 439,909 $ 414,260 $ 1,243,731 $ 1,156,048
[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.