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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Segment EBITDA [1] $ 414,156 $ 386,685 $ 792,518 $ 735,706
Depreciation (156,776) (142,450) (303,623) (275,634)
Amortization of intangibles (31,344) (26,474) (61,886) (52,573)
Impairments and other operating items (3,902) (7,073) (20,014) (8,104)
Interest expense (37,245) (32,426) (74,533) (64,796)
Interest income 1,818 1,056 5,129 2,210
Other income, net 805 2,031 3,363 1,644
Foreign currency transaction gain (loss) 1,115 30 1,218 (190)
Income before income tax provision 188,627 181,379 342,172 338,263
Eastern [Member]        
Segment EBITDA [1] 85,048 73,755 162,005 140,040
Southern [Member]        
Segment EBITDA [1] 74,511 68,787 148,889 137,694
Western [Member]        
Segment EBITDA [1] 86,440 81,175 163,444 153,832
Central [Member]        
Segment EBITDA [1] 74,506 64,172 137,534 123,742
Canada [Member]        
Segment EBITDA [1] 67,664 67,305 126,908 126,571
Exploration and Production [Member]        
Segment EBITDA [1] 33,433 31,231 65,042 59,910
Corporate [Member]        
Segment EBITDA [1],[2] (7,446) 260 (11,304) (6,083)
Operating Segments [Member]        
Segment EBITDA $ 421,602 $ 386,425 $ 803,822 $ 741,789
[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.