Segment Reporting (Summary of Financial Information Concerning Company's Reportable Segments) (Detail) - USD ($) $ in Thousands		3 Months Ended										12 Months Ended
		Dec. 31, 2018		Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017		Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenue		$ 1,261,732		$ 1,281,110	$ 1,239,968	$ 1,140,131	$ 1,157,175		$ 1,206,478	$ 1,175,569	$ 1,091,266	$ 4,922,941		$ 4,630,488		$ 3,375,863
Segment EBITDA	[1]											1,532,849		1,416,075		943,888
Depreciation and amortization												680,487		632,484		463,912
Capital expenditures												546,145		479,287		344,723
Total assets	[2]	12,627,329					12,014,681					12,627,329		12,014,681		11,103,925
Intercompany Revenues [Member]
Segment Reporting Information [Line Items]
Revenue	[3]											(709,889)		(640,886)		(470,465)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue												5,632,830		5,271,374		3,846,328
Segment EBITDA												1,541,060		1,448,576		1,063,103
Southern [Member]
Segment Reporting Information [Line Items]
Revenue												1,122,548		1,115,864		713,381
Segment EBITDA	[1]											276,791		258,560		163,320
Depreciation and amortization												153,923		151,417		99,323
Capital expenditures												97,442		117,441		64,624
Total assets	[2]	2,892,994					2,718,296					2,892,994		2,718,296		2,869,841
Southern [Member] | Intercompany Revenues [Member]
Segment Reporting Information [Line Items]
Revenue	[3]											(150,485)		(146,283)		(96,545)
Southern [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue												1,273,033		1,262,147		809,926
Segment EBITDA												276,791		258,560		163,320
Eastern [Member]
Segment Reporting Information [Line Items]
Revenue												1,090,019		959,214		626,644
Segment EBITDA	[1]											299,162		273,942		189,220
Depreciation and amortization												167,914		136,998		88,748
Capital expenditures												137,335		101,569		77,478
Total assets	[2]	2,688,341					2,024,527					2,688,341		2,024,527		1,519,576
Eastern [Member] | Intercompany Revenues [Member]
Segment Reporting Information [Line Items]
Revenue	[3]											(224,833)		(178,394)		(114,639)
Eastern [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue												1,314,852		1,137,608		741,283
Segment EBITDA												299,162		273,942		189,220
Western [Member]
Segment Reporting Information [Line Items]
Revenue												1,043,928		1,007,230		935,319
Segment EBITDA	[1]											318,401		323,648		315,708
Depreciation and amortization												95,400		95,724		89,198
Capital expenditures												125,112		100,000		86,200
Total assets	[2]	1,596,129					1,573,955					1,596,129		1,573,955		1,516,870
Western [Member] | Intercompany Revenues [Member]
Segment Reporting Information [Line Items]
Revenue	[3]											(126,454)		(119,916)		(116,318)
Western [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue												1,170,382		1,127,146		1,051,637
Segment EBITDA												318,401		323,648		315,708
Canada [Member]
Segment Reporting Information [Line Items]
Revenue												727,213		728,777		417,869	[4],[5]
Segment EBITDA	[1]											261,233		264,693		153,446	[4],[5]
Depreciation and amortization												124,155		121,174		71,228	[4],[5]
Capital expenditures												66,319		62,690		25,380	[4],[5]
Total assets	[2]	2,412,971					2,677,557					2,412,971		2,677,557		2,554,324	[4],[5]
Canada [Member] | Intercompany Revenues [Member]
Segment Reporting Information [Line Items]
Revenue	[3]											(96,776)		(99,978)		(58,716)	[4],[5]
Canada [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue												823,989		828,755		476,585	[4],[5]
Segment EBITDA												261,233		264,693		153,446
Central [Member]
Segment Reporting Information [Line Items]
Revenue												693,525	[4],[5]	628,167	[4],[5]	561,541
Segment EBITDA	[1]											255,648	[4],[5]	237,136	[4],[5]	208,930
Depreciation and amortization												87,802	[4],[5]	78,199	[4],[5]	70,027
Capital expenditures												90,525	[4],[5]	78,000	[4],[5]	71,888
Total assets	[2]	1,491,301	[4],[5]				1,297,118	[4],[5]				1,491,301	[4],[5]	1,297,118	[4],[5]	1,302,900
Central [Member] | Intercompany Revenues [Member]
Segment Reporting Information [Line Items]
Revenue	[3]											(103,966)	[4],[5]	(88,488)	[4],[5]	(72,852)
Central [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue												797,491	[4],[5]	716,655	[4],[5]	634,393
Segment EBITDA												255,648		237,136		208,930
Exploration and Production [Member]
Segment Reporting Information [Line Items]
Revenue												245,708		191,236		121,109
Segment EBITDA	[1]											129,825		90,597		32,479
Depreciation and amortization												44,175		42,500		41,215
Capital expenditures												25,937		12,274		10,178
Total assets	[2]	969,808					981,980					969,808		981,980		1,068,086
Exploration and Production [Member] | Intercompany Revenues [Member]
Segment Reporting Information [Line Items]
Revenue	[3]											(7,375)		(7,827)		(11,395)
Exploration and Production [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue												253,083		199,063		132,504
Segment EBITDA												129,825		90,597		32,479
Corporate [Member]
Segment Reporting Information [Line Items]
Segment EBITDA	[1],[4],[5]											(8,211)		(32,501)		(119,215)
Depreciation and amortization	[4],[5]											7,118		6,472		4,173
Capital expenditures	[4],[5]											3,475		7,313		8,975
Total assets	[2],[4],[5]	$ 575,785					$ 741,248					$ 575,785		$ 741,248		$ 272,328

[1] For those items included in the determination of segment EBITDA, the accounting policies of the segments are the same as those described in Note 1.

[2] Goodwill is included within total assets for each of the Company's six operating segments.

[3] 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.

[4] Corporate assets include cash, net deferred tax assets, debt issuance costs, equity investments, and corporate facility leasehold improvements and equipment.

[5] 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. For the year ended December 31, 2016, amounts also include costs associated with the Progressive Waste acquisition, including direct acquisition expenses, severance-related expenses, excise taxes, share-based compensation expenses associated with Progressive Waste share-based grants existing at June 1, 2016 and incentive compensation expenses based on the achievement of acquisition synergy goals. For the years ended December 31, 2017 and 2018, amounts also include Progressive Waste integration-related expenses, direct acquisition expenses and share-based compensation expenses associated with Progressive Waste share-based grants existing at June 1, 2016