Segment Reporting (Summary of Financial Information Concerning Company's Reportable Segments) (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Revenue		$ 1,352,404	$ 1,244,637
Segment EBITDA	[1]	400,928	378,361
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue		1,549,495	1,416,616
Segment EBITDA		404,559	382,219
Intercompany Revenue [Member]
Segment Reporting Information [Line Items]
Revenue	[2]	(197,091)	(171,979)
Eastern [Member]
Segment Reporting Information [Line Items]
Revenue		332,202	292,827
Segment EBITDA	[1]	84,662	76,957
Eastern [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue		397,000	346,846
Eastern [Member] | Intercompany Revenue [Member]
Segment Reporting Information [Line Items]
Revenue	[2]	(64,798)	(54,019)
Southern [Member]
Segment Reporting Information [Line Items]
Revenue		309,387	287,329
Segment EBITDA	[1]	74,517	74,377
Southern [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue		351,502	324,482
Southern [Member] | Intercompany Revenue [Member]
Segment Reporting Information [Line Items]
Revenue	[2]	(42,115)	(37,153)
Western [Member]
Segment Reporting Information [Line Items]
Revenue		271,981	254,979
Segment EBITDA	[1]	81,029	77,005
Western [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue		305,436	286,175
Western [Member] | Intercompany Revenue [Member]
Segment Reporting Information [Line Items]
Revenue	[2]	(33,455)	(31,196)
Central [Member]
Segment Reporting Information [Line Items]
Revenue		208,542	177,877
Segment EBITDA	[1]	73,151	63,027
Central [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue		237,570	202,792
Central [Member] | Intercompany Revenue [Member]
Segment Reporting Information [Line Items]
Revenue	[2]	(29,028)	(24,915)
Canada [Member]
Segment Reporting Information [Line Items]
Revenue		170,423	168,347
Segment EBITDA	[1]	59,398	59,244
Canada [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue		193,107	190,286
Canada [Member] | Intercompany Revenue [Member]
Segment Reporting Information [Line Items]
Revenue	[2]	(22,684)	(21,939)
Exploration and Production [Member]
Segment Reporting Information [Line Items]
Revenue		59,869	63,278
Segment EBITDA	[1]	31,802	31,609
Exploration and Production [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue		64,880	66,035
Exploration and Production [Member] | Intercompany Revenue [Member]
Segment Reporting Information [Line Items]
Revenue	[2]	(5,011)	(2,757)
Corporate [Member]
Segment Reporting Information [Line Items]
Revenue
Segment EBITDA	[1],[3]	$ (3,631)	(3,858)
Corporate [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue
Corporate [Member] | Intercompany Revenue [Member]
Segment Reporting Information [Line Items]
Revenue

[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, direct acquisition expenses, other administrative functions and share-based compensation expenses associated with Progressive Waste share-based grants outstanding at June 1, 2016 that were continued by the Company. Amounts reflected are net of allocations to the six operating segments.