Waste Connections (WCN) 10-Q 26 Jul 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 20, 2017
Document Documentand Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Entity Registrant Name	WASTE CONNECTIONS, INC.
Entity Central Index Key	1,318,220
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		263,636,010

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and equivalents	$ 399,741	$ 154,382
Accounts receivable, net of allowance for doubtful accounts of $14,947 and $13,160 at June 30, 2017 and December 31, 2016, respectively	547,671	485,138
Current assets held for sale	8,731	6,339
Prepaid expenses and other current assets	93,053	97,533
Total current assets	1,049,196	743,392
Property and equipment, net	4,729,335	4,738,055
Goodwill	4,589,573	4,390,261
Intangible assets, net	1,083,787	1,067,158
Restricted assets	60,393	63,406
Long-term assets held for sale	79,448	33,989
Other assets, net	63,631	67,664
Total assets	11,655,363	11,103,925
Current liabilities:
Accounts payable	239,150	251,253
Book overdraft	30,585	10,955
Accrued liabilities	270,621	269,402
Deferred revenue	140,070	134,081
Current portion of contingent consideration	27,097	21,453
Current liabilities held for sale	6,365	3,383
Current portion of long-term debt and notes payable	11,511	1,650
Total current liabilities	725,399	692,177
Long-term debt and notes payable	3,963,909	3,616,760
Long-term portion of contingent consideration	31,218	30,373
Long-term liabilities held for sale	463
Other long-term liabilities	304,179	331,074
Deferred income taxes	822,209	778,664
Total liabilities	5,847,377	5,449,048
Commitments and contingencies (Note 17)
Equity:
Common shares: 263,637,093 shares issued and 263,425,440 shares outstanding at June 30, 2017; 263,140,777 shares issued and 262,803,380 shares outstanding at December 31, 2016	4,184,489	4,174,808
Additional paid-in capital	102,479	102,220
Accumulated other comprehensive income (loss)	26,108	(43,001)
Treasury shares: 211,653 and 337,397 shares at June 30, 2017 and December 31, 2016, respectively
Retained earnings	1,487,171	1,413,488
Total Waste Connections' equity	5,800,247	5,647,515
Noncontrolling interest in subsidiaries	7,739	7,362
Total equity	5,807,986	5,654,877
Total liabilities and shareholders' equity	$ 11,655,363	$ 11,103,925

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 14,947	$ 13,160
Common stock, shares issued	263,637,093	263,140,777
Common stock, shares outstanding	263,425,440	262,803,380
Treasury shares	211,653	337,397

Condensed Consolidated Statemen

Condensed Consolidated Statements of Net Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenues	$ 1,175,569	$ 727,639	$ 2,266,835	$ 1,242,319
Operating expenses:
Cost of operations	685,900	416,262	1,329,281	703,453
Selling, general and administrative	126,350	152,737	255,400	220,419
Depreciation	132,827	84,348	258,067	145,245
Amortization of intangibles	24,762	14,081	50,272	21,775
Impairments and other operating items	(1,180)	(3,284)	140,501	(3,048)
Operating income	206,910	63,495	233,314	154,475
Interest expense	(31,160)	(20,485)	(60,291)	(37,670)
Other income (expense), net	1,860	(714)	3,326	(492)
Foreign currency transaction gain (loss)	(1,048)	689	(1,638)	689
Income before income tax provision	176,562	42,985	174,711	117,002
Income tax provision	(52,675)	(15,265)	(35,804)	(44,265)
Net income	123,887	27,720	138,907	72,737
Less: Net income attributable to noncontrolling interests	(231)	(231)	(377)	(406)
Net income attributable to Waste Connections	$ 123,656	$ 27,489	$ 138,530	$ 72,331
Earnings (loss) per common share attributable to Waste Connections' common stockholders:
Basic	$ 0.47	$ 0.13	$ 0.53	$ 0.37
Diluted	$ 0.47	$ 0.13	$ 0.52	$ 0.37
Shares used in the per share calculations:
Basic	263,387,338	210,305,335	263,225,541	197,244,873
Diluted	264,109,594	210,880,732	264,007,307	198,036,792
Cash dividends per common share	$ 0.12	$ 0.097	$ 0.24	$ 0.193

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net income	$ 123,887	$ 27,720	$ 138,907	$ 72,737
Other comprehensive income (loss), before tax:
Foreign currency translation adjustment	53,193	12,651	70,627	12,651
Other comprehensive income (loss), before tax	50,897	13,620	68,179	9,138
Income tax (expense) benefit related to items of other comprehensive income (loss)	(1,338)	(346)	930	1,360
Other comprehensive income (loss), net of tax	49,559	13,274	69,109	10,498
Comprehensive income	173,446	40,994	208,016	83,235
Less: Comprehensive income attributable to noncontrolling interests	(231)	(231)	(377)	(406)
Comprehensive income attributable to Waste Connections	173,215	40,763	207,639	82,829
Interest Rate Swap [Member]
Other comprehensive income (loss), before tax:
Amounts reclassified, gross	760	1,693	1,841	3,403
Changes in fair value, gross	(2,904)	(3,826)	(1,876)	(10,514)
Fuel [Member] | Commodity Contract [Member]
Other comprehensive income (loss), before tax:
Amounts reclassified, gross	1,012	1,473	1,976	3,274
Changes in fair value, gross	$ (1,164)	$ 1,629	$ (4,389)	$ 324

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Equity - USD ($)	Common Stock [Member]Deferred Compensation Plan [Member]	Common Stock [Member]Performance Shares [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Noncontrolling Interests [Member]	Total
Beginning Balances at Dec. 31, 2015			$ 1,224,000	$ 736,652,000	$ (12,171,000)		$ 1,259,495,000	$ 6,584,000	$ 1,991,784,000
Beginning Balances, shares at Dec. 31, 2015			183,563,933
Conversion of Old Waste Connections' common shares into common shares of New Waste Connections, APIC				(650,552,000)
Conversion of Old Waste Connections' common shares into common shares of New Waste Connections			$ 650,552,000
Issuance of common shares to acquire Progressive Waste			$ 3,503,162,000						3,503,162,000
Issuance of common shares to acquire Progressive Waste, shares			78,218,878
Acquired common shares held in trust						735,168
Sale of common shares held in trust			$ 8,436,000			$ (172,658)			8,436,000
Sale of common shares held in trust, shares			172,658
Vesting of restricted share units (shares)	58,992	184,440	596,728
Tax withholdings related to net share settlements of equity-based compensation				(11,349,000)					(11,349,000)
Tax withholdings related to net share settlements of restricted share units, shares			(276,771)
Equity-based compensation				13,026,000					13,026,000
Exercise of warrants, shares			37,543
Excess tax benefit associated with equity-based compensation				5,015,000					5,015,000
Cash dividends on common shares							(35,585,000)		(35,585,000)
Amounts reclassified into earnings, net of taxes					4,130,000				4,130,000
Changes in fair value of cash flow hedges, net of taxes					(6,283,000)				(6,283,000)
Foreign currency translation adjustment					12,651,000				12,651,000
Distributions to noncontrolling interests								(3,000)	(3,000)
Net income							72,331,000	406,000	72,737,000
Ending Balances at Jun. 30, 2016			$ 4,163,374,000	92,792,000	(1,673,000)		1,296,241,000	6,987,000	5,557,721,000
Ending Balances, shares at Jun. 30, 2016			262,556,401
Ending Balance, treasury shares at Jun. 30, 2016						562,510
Beginning Balances at Dec. 31, 2016			$ 4,174,808,000	102,220,000	(43,001,000)		1,413,488,000	7,362,000	$ 5,654,877,000
Beginning Balances, shares at Dec. 31, 2016			262,803,383						262,803,380
Beginning Balance, treasury shares at Dec. 31, 2016						337,397			337,397
Sale of common shares held in trust			$ 7,735,000						$ 7,735,000
Sale of common shares held in trust, shares			125,744			(125,744)
Vesting of restricted share units (shares)	36,619	122,786	534,881
Tax withholdings related to net share settlements of equity-based compensation				(13,621,000)					(13,621,000)
Tax withholdings related to net share settlements of restricted share units, shares			(247,927)
Equity-based compensation				13,880,000					13,880,000
Exercise of stock options and warrants			$ 1,946,000						1,946,000
Exercise of stock options and warrants, shares			49,954
Cash dividends on common shares							(63,463,000)		(63,463,000)
Amounts reclassified into earnings, net of taxes					2,575,000				2,575,000
Changes in fair value of cash flow hedges, net of taxes					(4,093,000)				(4,093,000)
Foreign currency translation adjustment					70,627,000				70,627,000
Net income							138,530,000	377,000	138,907,000
Ending Balances at Jun. 30, 2017			$ 4,184,489,000	$ 102,479,000	$ 26,108,000		1,487,171,000	$ 7,739,000	$ 5,807,986,000
Ending Balances, shares at Jun. 30, 2017			263,425,440						263,425,440
Ending Balance, treasury shares at Jun. 30, 2017						211,653			211,653
Cumulative effect adjustment from adoption of new accounting pronouncement							$ (1,384,000)		$ (1,384,000)

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 138,907	$ 72,737
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on disposal of assets and impairments	128,608	509
Depreciation	258,067	145,245
Amortization of intangibles	50,272	21,775
Foreign currency transaction (gain) loss	1,638	(689)
Deferred income taxes, net of acquisitions	(10,378)	25,363
Amortization of debt issuance costs	2,101	2,842
Share-based compensation	23,364	26,405
Interest income on restricted assets	(283)	(246)
Interest accretion	6,887	3,629
Excess tax benefit associated with equity-based compensation		(5,015)
Adjustments to contingent consideration	11,013	(2,495)
Payment of contingent consideration recorded in earnings		(132)
Net change in operating assets and liabilities, net of acquisitions	(58,290)	(30,282)
Net cash provided by operating activities	551,906	259,646
Cash flows from investing activities:
Payments for acquisitions, net of cash acquired	(347,936)	(12,541)
Cash acquired from acquisition		65,745
Capital expenditures for property and equipment	(202,617)	(112,087)
Proceeds from disposal of assets	20,617	1,560
Change in restricted assets, net of interest income	3,689	113
Other	(1,732)	(696)
Net cash used in investing activities	(527,979)	(57,906)
Cash flows from financing activities:
Proceeds from long-term debt	864,952	3,352,676
Principal payments on notes payable and long-term debt	(585,762)	(3,461,005)
Payment of contingent consideration recorded at acquisition date	(5,565)	(4,109)
Change in book overdraft	19,479	1,998
Proceeds from option and warrant exercises	1,946
Excess tax benefit associated with equity-based compensation		5,015
Payments for cash dividends	(63,463)	(35,585)
Tax withholdings related to net share settlements of restricted share units	(13,621)	(11,349)
Distributions to noncontrolling interests		(3)
Debt issuance costs	(3,519)	(12,941)
Proceeds from sale of common shares held in trust	7,735	8,436
Other	(1,094)
Net cash provided by (used in) financing activities	221,088	(156,867)
Effect of exchange rate changes on cash and equivalents	649	(223)
Net increase in cash and equivalents	245,664	44,650
Cash and equivalents at beginning of period	154,382	10,974
Less: change in cash held for sale	(305)
Cash and equivalents at end of period	399,741	55,624
Non-cash financing activity:
Liabilities assumed and notes payable issued to sellers of businesses acquired	136,090	2,566,335
Non-cash consideration received for asset sales	$ 12,632
Issuance of common shares to acquire Progressive Waste		$ 3,503,162

Basis of Presentation and Summa

Basis of Presentation and Summary	6 Months Ended
	Jun. 30, 2017
Basis of Presentation and Summary [Abstract]
Basis of Presentation and Summary	1. BASIS OF PRESENTATION AND SUMMARY On June 1, 2016, pursuant to the terms of the Agreement and Plan of Merger dated as of January 18, 2016 (the “Merger Agreement”), Water Merger Sub LLC (“Merger Sub”), a Delaware limited liability company and a wholly-owned subsidiary of Progressive Waste Solutions Ltd., merged with and into Waste Connections US, Inc. (f/k/a Waste Connections, Inc.), a Delaware corporation (“Old Waste Connections”) with Old Waste Connections continuing as the surviving corporation and an indirect wholly-owned subsidiary of Waste Connections, Inc. (f/k/a Progressive Waste Solutions Ltd.), a corporation organized under the laws of Ontario, Canada (the “Progressive Waste acquisition”). Following the closing of the transaction, Old Waste Connections’ common stock was delisted from the New York Stock Exchange (“NYSE”) and deregistered under the U.S. Securities Exchange Act of 1934, as amended (the “Exchange Act”). Pursuant to the Merger Agreement, Old Waste Connections’ stockholders received common shares of Waste Connections, Inc. (f/k/a Progressive Waste Solutions Ltd.) in exchange for their shares of common stock of Old Waste Connections. As further discussed in Note 6 – “Acquisitions,” the Progressive Waste acquisition was accounted for as a reverse merger using the acquisition method of accounting. Old Waste Connections has been identified as the acquirer for accounting purposes and the acquisition method of accounting has been applied. The term “Progressive Waste” is used herein in the context of references to Progressive Waste Solutions Ltd. and its shareholders prior to the completion of the Progressive Waste acquisition on June 1, 2016. The accompanying condensed consolidated financial statements relating to Waste Connections, Inc. (f/k/a Progressive Waste Solutions Ltd., and together with its subsidiaries, “New Waste Connections,” “WCI” or the “Company”) are the historical financial statements of Old Waste Connections for the three and six month periods ended June 30, 2017 and 2016, with the inclusion on June 1, 2016 of the fair value of the assets and liabilities acquired from Progressive Waste and the inclusion of the results of operations from the acquired Progressive Waste operations commencing on June 1, 2016. In the opinion of management, the accompanying balance sheets and related interim statements of net income, comprehensive income, cash flows and equity include all adjustments, consisting only of normal recurring items, necessary for their fair statement in conformity with U.S. generally accepted accounting principles (“GAAP”). Preparing financial statements requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses. Examples include accounting for landfills, self-insurance accruals, income taxes, allocation of acquisition purchase price, contingent consideration accruals and asset impairments. An additional area that involves estimation is when the Company estimates the amount of potential exposure it may have with respect to litigation, claims and assessments in accordance with the accounting guidance on contingencies. Actual results for all estimates could differ materially from the estimates and assumptions that the Company uses in the preparation of its condensed consolidated financial statements. Interim results are not necessarily indicative of results for a full year. These interim financial statements should be read in conjunction with the financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2016.

Reporting Currency

Reporting Currency	6 Months Ended
	Jun. 30, 2017
Reporting Currency [Abstract]
Reporting Currency	2. REPORTING CURRENCY The functional currency of the Company, as the parent corporate entity, and its operating subsidiaries in the United States, is the U.S. dollar. The functional currency of the Company’s Canadian operations is the Canadian dollar. The reporting currency of the Company is the U.S. dollar. The Company’s consolidated Canadian dollar financial position is translated to U.S. dollars by applying the foreign currency exchange rate in effect at the consolidated balance sheet date. The Company’s consolidated Canadian dollar results of operations and cash flows are translated to U.S. dollars by applying the average foreign currency exchange rate in effect during the reporting period. The resulting translation adjustments are included in other comprehensive income or loss. Gains and losses from foreign currency transactions are included in earnings for the period.

New Accounting Standards

New Accounting Standards	6 Months Ended
	Jun. 30, 2017
New Accounting Standards [Abstract]
New Accounting Standards	3. NEW ACCOUNTING STANDARDS Revenue From Contracts With Customers . In May 2014, the Financial Accounting Standards Board (the “FASB”) issued guidance to provide a single, comprehensive revenue recognition model for all contracts with customers. The revenue guidance contains principles that an entity will apply to determine the measurement of revenue and timing of when it is recognized. The underlying principle is that an entity will recognize revenue to depict the transfer of goods or services to customers at an amount that the entity expects to be entitled to in exchange for those goods or services. The standard will be effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017 for public entities, with early adoption permitted (but not earlier than the original effective date of the pronouncement). Based on the Company’s work to date, it believes it has identified all material contract types and costs that may be impacted by this amended guidance. The Company expects to quantify and disclose the expected impact, if any, of adopting this amended guidance in the Quarterly Report on Form 10-Q for the third quarter of 2017. While the Company is still evaluating the impact of the amended guidance, it currently does not expect it to have a material impact on operating revenues. Upon adoption of the amended guidance, the Company anticipates recognizing an asset from the capitalization of sales incentives as contract acquisition costs. Under the amended guidance, sales incentives will be capitalized and amortized over the expected life of the customer relationship. Currently, the Company expenses approximately $16,000 in sales incentives annually. As noted above, the Company is still evaluating the possible impacts on the Company’s disclosures and on its consolidated financial statements, including potential changes in the classification of certain revenue streams and costs currently reported on a gross basis and the amount of sales incentives that will be capitalized. The Company is currently planning to adopt the amended guidance using the modified retrospective method as of January 1, 2018. Balance Sheet Classification of Deferred Taxes . In November 2015, the FASB issued guidance that requires that all deferred tax assets and liabilities, along with any related valuation allowance, be classified as noncurrent on the balance sheet. As a result, each jurisdiction will now only have one net noncurrent deferred tax asset or liability. The guidance does not change the existing requirement that only permits offsetting within a jurisdiction. The new standard is effective in fiscal years beginning after December 15, 2016, including interim periods within those years. The Company adopted this guidance as of January 1, 2017, which resulted in the Company’s current deferred tax assets being recorded as noncurrent on a retrospective basis. The Company’s current deferred tax assets were $82,440 and $89,177 at June 30, 2017 and December 31, 2016, respectively. Lease Accounting . In February 2016, the FASB issued guidance that requires lessees to recognize a right-of-use asset and a lease liability for virtually all of their leases (other than leases that meet the definition of a short-term lease). The liability will be equal to the present value of lease payments. The asset will be based on the liability, subject to adjustment, such as for initial direct costs. For income statement purposes, the FASB retained a dual model, requiring leases to be classified as either operating or finance. Operating leases will result in straight-line expense (similar to current operating leases) while finance leases will result in a front-loaded expense pattern (similar to current capital leases). Classification will be based on criteria that are largely similar to those applied in current lease accounting, but without explicit bright lines. The new standard is effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. The new standard must be adopted using a modified retrospective transition, and provides for certain practical expedients. Transition will require application of the new guidance at the beginning of the earliest comparative period presented. The Company has not yet assessed the potential impact of implementing this new accounting standard on its consolidated financial statements. Improvements to Employee Share-Based Payment Accounting . In March 2016, the FASB issued guidance that identifies areas for simplification involving several aspects of accounting for share-based payment transactions, including classification of awards as either equity or liabilities, an option to recognize gross share compensation expense with actual forfeitures recognized as they occur, certain classifications on the statement of cash flows and income tax consequences, including that all income tax effects of awards are to be recognized in the income statement when the awards are settled whereas previously the tax benefits in excess of compensation cost were recorded in equity. The new standard is effective for public companies for annual reporting periods beginning after December 15, 2016, and interim periods within that reporting period. As such, the Company adopted this standard on January 1, 2017 and classified the excess tax benefits associated with equity-based compensation arrangements, which were $6,792 during the six months ended June 30, 2017, as a discrete item within Income tax provision on the Condensed Consolidated Statements of Net Income, rather than recognizing such excess income tax benefits in Additional paid-in capital on the Condensed Consolidated Statements of Equity. This reclassification was made on a prospective basis and also impacted the related classification on the Company’s Condensed Consolidated Statements of Cash Flows as excess tax benefits associated with equity-based compensation arrangements were previously reported in cash flows from operating activities and cash flows from financing activities. Under the new standard, excess tax benefits associated with equity-based compensation are only reported in cash flows from operating activities. Additionally, the Company now recognizes gross share compensation expense with actual forfeitures as they occur, which differs from the Company’s previous accounting policy to estimate forfeitures each period. Using the modified retrospective approach, the Company recorded a cumulative effect adjustment to Retained earnings of $1,384 for the differential between the amount of compensation cost previously recorded and the amount that would have been recorded without assuming forfeitures.  Classification of Certain Cash Receipts and Cash Payments . In August 2016, the FASB issued guidance that addresses eight targeted changes with respect to how cash receipts and cash payments are classified in the statements of cash flows, with the objective of reducing diversity in practice . The new standard is effective for public companies for financial statements issued for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, provided that all of the amendments are adopted in the same period. The guidance requires application using a retrospective transition method. The Company does not expect the adoption of this guidance to have a material impact on the Company’s statement of cash flows. Accounting for Income Taxes: Intra-Entity Asset Transfers of Assets Other than Inventory . In October 2016, the FASB issued guidance that eliminates the exception for all intra-entity sales of assets other than inventory. As a result, a reporting entity would recognize the tax expense from the sale of the asset in the seller’s tax jurisdiction when the transfer occurs, even though the pre-tax effects of that transaction are eliminated in consolidation. Any deferred tax asset that arises in the buyer’s jurisdiction would also be recognized at the time of the transfer. The modified retrospective approach will be required for transition to the new guidance, with a cumulative-effect adjustment recorded in retained earnings as of the beginning of the period of adoption. The new guidance will be effective for public business entities in fiscal years beginning after December 15, 2017, including interim periods within those years. Early adoption is permitted; however, the guidance can only be adopted in the first interim period of a fiscal year. The Company does not expect the adoption of this guidance to have a material impact on the consolidated financial statements. Statement of Cash Flows: Restricted Cash . In November 2016, the FASB issued guidance that requires that the statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Entities will also be required to reconcile such total to amounts on the balance sheet and disclose the nature of the restrictions. The new standard is effective for public companies for financial statements issued for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. If an entity early adopts the amendments in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. The Company does not expect the adoption of this guidance to have a material impact on the Company’s statement of cash flows. Simplifying the Test for Goodwill Impairment . In January 2017, the FASB issued guidance that simplifies the accounting for goodwill impairment. The guidance removes Step 2 of the goodwill impairment test, which requires a hypothetical purchase price allocation. A goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. All other goodwill impairment guidance will remain largely unchanged. The new standard will be applied prospectively, and is effective for public companies for their annual or any interim goodwill impairment tests for fiscal years beginning after December 15, 2019. Early adoption is permitted for any impairment tests performed after January 1, 2017. The Company early adopted this new guidance on January 1, 2017. During the year ended December 31, 2016, the Company did not record any impairment charges related to goodwill; however, the results of the Company’s annual impairment testing indicated that the carrying value of its E&P segment exceeded its fair value by more than $77,343 , which was the carrying value of goodwill at its E&P segment at December 31, 2016. Upon adopting this accounting guidance in the first quarter of 2017, the Company performed an updated impairment test for its E&P segment which showed its carrying value continued to exceed its fair value by an amount in excess of the carrying amount of goodwill, or $77,343 . Therefore, the Company recorded an impairment charge of $77,343 , consisting of the carrying amount of goodwill at its E&P segment at January 1, 2017, to Impairments and other operating charges in the Condensed Consolidated Statements of Net Income during the six months ended June 30, 2017. Stock Compensation: Scope of Modification Accounting . In May 2017, the FASB issued guidance to clarify when to account for a change to the terms or conditions of a share-based payment award as a modification. Under the new guidance, modification accounting is required only if the fair value, the vesting conditions, or the classification of the award (as equity or liability) changes as a result of the change in terms or conditions. The new standard is effective prospectively for all companies for annual periods beginning on or after December 15, 2017. Early adoption is permitted. The Company does not expect the adoption of this guidance to have a material impact on the consolidated financial statements.  

Reclassification

Reclassification	6 Months Ended
	Jun. 30, 2017
Reclassification [Abstract]
Reclassification	4. RECLASSIFICATION As disclosed within other footnotes of the financial statements, deferred tax amounts reported in the Company’s prior year have been reclassified to conform with the 2017 presentation.

Landfill Accounting

Landfill Accounting	6 Months Ended
	Jun. 30, 2017
Landfill Accounting [Abstract]
Landfill Accounting	5. LANDFILL ACCOUNTING At June 30, 2017, the Company owned or operated 68 municipal solid waste (“MSW”) landfills, 11 exploration and production (“E&P”) waste landfills, which only accept E&P waste, and 14 non-MSW landfills, which only accept construction and demolition, industrial and other non-putrescible waste. At June 30, 2017, the Company’s landfills consisted of 79 owned landfills, eight landfills operated under life-of-site operating agreements and six landfills operated under limited-term operating agreements. The Company’s landfills had site costs with a net book value of $2,689,906 at June 30, 2017. For the Company’s landfills operated under limited-term operating agreements and life-of-site operating agreements, the owner of the property (generally a municipality) usually owns the permit and the Company operates the landfill for a contracted term. Where the contracted term is not the life of the landfill, the property owner is generally responsible for final capping, closure and post-closure obligations. The Company is responsible for all final capping, closure and post-closure liabilities at the landfills it operates under life-of-site operating agreements. The Company’s internal and third-party engineers perform surveys at least annually to estimate the remaining disposal capacity at its landfills. Many of the Company’s existing landfills have the potential for expanded disposal capacity beyond the amount currently permitted. The Company’s landfill depletion rates are based on the remaining disposal capacity, considering both permitted and probable expansion airspace, at the landfills it owns and landfills it operates, but does not own, under life-of-site agreements. The Company’s landfill depletion rate is based on the term of the operating agreement at its operated landfill that has capitalized expenditures. Expansion airspace consists of additional disposal capacity being pursued through means of an expansion that has not yet been permitted. Expansion airspace that meets certain criteria is included in the estimate of total landfill airspace. Based on remaining permitted capacity as of June 30, 2017, and projected annual disposal volumes, the average remaining landfill life for the Company’s owned landfills and landfills operated under life-of-site operating agreements is estimated to be approximately 25 years. As of June 30, 2017, the Company is seeking to expand permitted capacity at 16 of its owned landfills and two landfills that it operates under life-of-site operating agreements, and considers the achievement of these expansions to be probable. Although the Company cannot be certain that all future expansions will be permitted as designed, the average remaining life, when considering remaining permitted capacity, probable expansion capacity and projected annual disposal volume, of the Company’s owned landfills and landfills operated under life-of-site operating agreements is approximately 31 years, with lives ranging from approximately 1 to 196 years. During the six months ended June 30, 2017 and 2016, the Company expensed $93,968 and $49,685 , respectively, or an average of $4.51 and $3.92 per ton consumed, respectively, related to landfill depletion at owned landfills and landfills operated under life-of-site agreements. The Company reserves for estimated final capping, closure and post-closure maintenance obligations at the landfills it owns and landfills it operates under life-of-site operating agreements. The Company calculates the net present value of its final capping, closure and post-closure liabilities by estimating the total obligation in current dollars, inflating the obligation based upon the expected date of the expenditure and discounting the inflated total to its present value using a credit-adjusted risk-free rate. Any changes in expectations that result in an upward revision to the estimated undiscounted cash flows are treated as a new liability and are inflated and discounted at rates reflecting current market conditions. Any changes in expectations that result in a downward revision (or no revision) to the estimated undiscounted cash flows result in a liability that is inflated and discounted at rates reflecting the market conditions at the time the cash flows were originally estimated. This policy results in the Company’s final capping, closure and post-closure liabilities being recorded in “layers.” The Company’s discount rate assumption for purposes of computing 2017 and 2016 “layers” for final capping, closure and post-closure obligations was 4.75% for both years, which reflects the Company’s long-term credit adjusted risk free rate as of the end of both 2016 and 2015. The Company’s inflation rate assumption is 2.5% for the years ending December 31, 2017 and 2016. The resulting final capping, closure and post-closure obligations are recorded on the condensed consolidated balance sheet along with an offsetting addition to site costs which is amortized to depletion expense as the remaining landfill airspace is consumed. Interest is accreted on the recorded liability using the corresponding discount rate. During the six months ended June 30, 2017 and 2016, the Company expensed $5,775 and $2,763 respectively, or an average of $0.27 and $0.22 per ton consumed, respectively, related to final capping, closure and post-closure accretion expense. The following is a reconciliation of the Company’s final capping, closure and post-closure liability balance from December 31, 2016 to June 30, 2017:   Final capping, closure and post-closure liability at December 31, 2016 $ 244,909  Adjustments to final capping, closure and post-closure liabilities (30,703)  Liabilities incurred 7,280  Accretion expense associated with landfill obligations 5,775  Closure payments (2,545)  Foreign currency translation adjustment 925  Final capping, closure and post-closure liability at June 30, 2017 $ 225,641  The Adjustments to final capping, closure and post-closure liabilities primarily consisted of decreases in estimated closure and post closure costs at several of our landfills, most notably our landfill at Seneca Meadows, and changes in engineering estimates related to timing of closure events and total site capacity. The Company performs its annual review of its cost and capacity estimates in the first quarter of each year. At June 30, 2017 and December 31, 2016, $57,135 and $55,388 of the Company’s restricted assets balance was for purposes of securing its performance of future final capping, closure and post-closure obligations. 

Acquisitions

Acquisitions	6 Months Ended
	Jun. 30, 2017
Acquisitions [Abstract]
Acquisitions	6. ACQUISITIONS Progressive Waste Acquisition As described in Note 1, on June 1, 2016, pursuant to the Merger Agreement, Merger Sub merged with and into Old Waste Connections in an all-stock business combination with Old Waste Connections continuing as the surviving corporation and an indirect wholly-owned subsidiary of New Waste Connections. The term “Progressive Waste” is used herein in the context of references to Progressive Waste Solutions Ltd. and its shareholders prior to the completion of the Progressive Waste acquisition on June 1, 2016. The financial statements presented herein are the historical financial statements of Old Waste Connections with the inclusion on June 1, 2016 of the fair value of the identifiable assets and liabilities acquired from Progressive Waste and the inclusion of the results of operations from the acquired Progressive Waste operations commencing on June 1, 2016. Under the terms of the Merger Agreement, Old Waste Connections’ stockholders received 3.1152645 New Waste Connections shares for each Old Waste Connections share they owned. Immediately following the completion of the Progressive Waste acquisition, New Waste Connections also completed (i) a consolidation whereby every 3.1152645 common shares outstanding were converted into one common share (the “Consolidation”) and (ii) an amalgamation with a wholly-owned subsidiary whereby its legal name was changed from Progressive Waste Solutions Ltd. to Waste Connections, Inc. (the “Amalgamation”). Upon completion of the Progressive Waste acquisition, Old Waste Connections’ former stockholders owned approximately 70% of the Company, and Progressive Waste’s former shareholders owned approximately 30% . All share amounts stated herein reflect shares on a post-Consolidation basis. Following the completion of the Progressive Waste acquisition, the Consolidation and the Amalgamation, on June 1, 2016, the post-Consolidation common shares of New Waste Connections (the “Common Shares”) commenced trading on the Toronto Stock Exchange (the “TSX”) and on the NYSE under the ticker symbol “WCN.” The common stock of Old Waste Connections, which traded previously under the symbol “WCN,” ceased trading on, and has been delisted from, the NYSE. The transaction was accounted for as a reverse merger using the acquisition method of accounting. Old Waste Connections has been identified as the acquirer for accounting purposes and the acquisition method of accounting has been applied. Identifying the acquirer requires various considerations including the relative voting rights post-closing, the size of minority voting interests and the composition of the board of directors and senior management. Based on these considerations, Old Waste Connections’ former stockholders hold a majority of the post-closing voting rights of the combined company and both the post-closing composition of the board of directors and senior management are most closely aligned with Old Waste Connections. The Progressive Waste acquisition provided the Company with significant strategic and financial benefits including enhanced size and revenue diversification, increased earnings and cash flows and better access to capital markets. The results of operations from the acquired Progressive Waste operations have been included in the Company’s Condensed Consolidated Financial Statements from June 1, 2016, the acquisition date. Total revenues during the period from January 1, 2017 to June 30, 2017, generated from the operations acquired in the Progressive Waste acquisition and included within consolidated revenues, were $1,001,653 . Total pre-tax earnings during the period from January 1, 2017 to June 30, 2017, generated from the operations acquired in the Progressive Waste acquisition and included within consolidated income before income taxes, were $116,887, and includes $50,377 of expenses recorded in Impairments and other operating items. The following table summarizes the consideration transferred to acquire Progressive Waste and the amounts of identifiable assets acquired and liabilities assumed:  Fair value of consideration transferred:  Shares issued $ 3,503,162  Debt assumed 1,729,274  5,232,436  Less: cash acquired (65,768)  Net fair value of consideration transferred 5,166,668  Recognized amounts of identifiable assets acquired and liabilities assumed associated with the business acquired:  Accounts receivable 231,709  Prepaid expenses and other current assets 28,623  Restricted assets 16,551  Property and equipment 2,063,011  Contracts 223,885  Customer lists 191,679  Other intangibles 218,499  Other assets 4,491  Accounts payable and accrued liabilities (264,992)  Deferred revenue (35,635)  Contingent consideration (19,412)  Other long-term liabilities (185,774)  Deferred income taxes (329,552)  Total identifiable net assets 2,143,083  Goodwill $ 3,023,585  Following the merger of Merger Sub into Old Waste Connections, and the issuance of 3.1152645 New Waste Connections shares for each Old Waste Connections share after giving effect to the Consolidation, the Company issued an additional 78,218,878 common shares at $44.79 , the closing price on the NYSE of New Waste Connections common shares on June 1, 2016 as share consideration for the Progressive Waste acquisition. The Company assumed $1,729,274 of debt in the acquisition, consisting of $1,659,465 of amounts outstanding under the Progressive Waste credit facilities that were repaid in full following the close of the acquisition, $64,000 of tax-exempt bonds and $5,809 of other long-term debt. Contingent consideration acquired consists primarily of two amounts payable to the former owners of an acquisition completed by Progressive Waste in 2015. The first contingent amount payable is based on the acquired operations exceeding earnings targets specified in the purchase agreement over a one -year period ending September 30, 2017. There is no limit to this contingent amount payable under the terms of the purchase agreement, the fair value of which was originally computed at $7,315 , based upon applying a discount rate of 2.0% to the probability assessment of the expected future cash flows over the period in which the obligation is expected to be settled. During the six months ended June 30, 2017, the Company recorded $11,313 to Impairments and other operating charges in the Condensed Consolidated Statements of Net Income to increase the fair value of the amount payable under this liability-classified contingent consideration arrangement. The second contingent amount payable had a maximum possible payment of $5,000 , representing a purchase price holdback payable to the former owners subject to the satisfaction of various business performance conditions through December 31, 2016, which was paid during the six months ended June 30, 2017. The goodwill acquired is primarily attributable to growth opportunities at operations acquired in the Progressive Waste acquisition and synergies that are expected to arise as a result of the acquisition. The expected tax deductible amount of the goodwill acquired is $303,594 . The fair value of acquired working capital related to certain tax, audit and legal matters of Progressive Waste is provisional pending final resolution of information that existed at the acquisition date to support the fair value of the assets acquired and liabilities assumed. Measurement period adjustments will be evaluated to determine whether they relate to facts and circumstances that existed at the acquisition date. Any measurement period adjustments recorded will be recognized in the reporting period in which they are identified. The gross amount of trade receivables due under contracts was $239,212 , of which $7,503 was expected to be uncollectible. The Company did not acquire any other class of receivable as a result of the Progressive Waste acquisition. The Company incurred $758 and $31,559 of acquisition-related costs for the Progressive Waste acquisition during the six months ended June 30, 2017 and 2016, respectively. These expenses are included in Selling, general and administrative expenses in the Company’s Condensed Consolidated Statements of Net Income. Other Acquisitions In January 2017, the Company acquired Groot Industries, Inc. (“Groot”). Groot is the largest privately-owned solid waste services company in Illinois with total annual revenue of approximately $200,000 . Groot serves approximately 300,000 customers primarily in northern Illinois from a network of seven collection operations, six transfer stations and one recycling facility. In addition to the acquisition of Groot, the Company acquired six individually immaterial non-hazardous solid waste collection businesses during the six months ended June 30, 2017. The total acquisition-related costs incurred during the six months ended June 30, 2017 for these acquisitions was $1,701 . These expenses are included in Selling, general and administrative expenses in the Company’s Condensed Consolidated Statements of Net Income. The Company acquired eight individually immaterial non-hazardous solid waste collection businesses during the six months ended June 30, 2016. The total acquisition-related costs incurred during the six months ended June 30, 2016 for these acquisitions was $ 636 . These expenses are included in Selling, general and administrative expenses in the Company’s Condensed Consolidated Statements of Net Income. The results of operations of these acquired businesses have been included in the Company’s Condensed Consolidated Financial Statements from their respective acquisition dates. The Company expects these acquired businesses to contribute towards the achievement of the Company’s strategy to expand through acquisitions. Goodwill acquired is attributable to the synergies and ancillary growth opportunities expected to arise after the Company’s acquisition of these businesses. The following table summarizes the consideration transferred and the preliminary amounts of identifiable assets acquired and liabilities assumed at the acquisition dates for the acquisitions consummated in the six months ended June 30, 2017 and 2016:   2017 Acquisitions 2016 Acquisitions Fair value of consideration transferred:  Cash $ 347,936 $ 12,541  Debt assumed 56,957 -  Notes issued to sellers 13,460 -  Fair value of operations exchanged 4,500 -  422,853 12,541  Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:  Accounts receivable 13,264 486  Prepaid expenses and other current assets 2,586 476  Property and equipment 128,298 2,782  Long-term franchise agreements and contracts 31,700 -  Customer lists 17,032 5,001  Other intangibles 27,261 -  Other assets 487 261  Accounts payable and accrued liabilities (11,119) (741)  Deferred revenue (3,176) (610)  Contingent consideration (15) (345)  Other long-term liabilities (1,080) -  Deferred income taxes (50,283) -  Total identifiable net assets 154,955 7,310  Goodwill $ 267,898 $ 5,231   Goodwill acquired during the six months ended June 30, 2017, totaling $11,111 , is expected to be deductible for tax purposes. The acquisitions of eight non-hazardous solid waste collection businesses resulted in goodwill acquired during the six months ended June 30, 2016, totaling $5,231 , which is expected to be deductible for tax purposes. The fair value of acquired working capital related to five individually immaterial acquisitions completed during the six months ended June 30, 2017, is provisional pending receipt of information from the acquirees to support the fair value of the assets acquired and liabilities assumed. Any adjustments recorded relating to finalizing the working capital for these five acquisitions are not expected to be material to the Company’s financial position. The gross amount of trade receivables due under contracts acquired during the six months ended June 30, 2017, is $13,964 , of which $700 is expected to be uncollectible. The gross amount of trade receivables due under contracts acquired during the six months ended June 30, 2016, is $876 , of which $390 is expected to be uncollectible. The Company did not acquire any other class of receivable as a result of the acquisitions of these businesses. Pro Forma Results of Operations The following pro forma results of operations assume that the Company’s acquisition of Progressive Waste and its other acquisitions that were collectively insignificant, occurring during the six months ended June 30, 2016, were acquired as of January 1, 2016 (unaudited):   Six Months Ended June 30,  2016  Total revenue $ 2,051,327  Net income 178,058  Basic income per share 0.68  Diluted income per share 0.67  The unaudited pro forma results of operations do not purport to be indicative of the results of operations which actually would have resulted had the acquisitions occurred on January 1, 2016, nor are they necessarily indicative of future operating results. The above unaudited pro forma financial information includes adjustments to acquisition expenses incurred by the Company and the acquired businesses, severance payments to employees terminated as a result of the acquisitions, equity-based compensation expenses incurred as a result of accelerated vesting resulting from the Progressive Waste acquisition, interest expense on new and refinanced debt attributable to the acquisitions, expenses associated with Progressive Waste interest rate swaps resulting from its credit facility being terminated, depreciation expense on acquired property and equipment, amortization of identifiable intangible assets acquired, depletion expense on acquired landfills and provision for income taxes.  

Assets Held for Sale

Assets Held for Sale	6 Months Ended
	Jun. 30, 2017
Assets Held for Sale [Abstract]
Assets Held for Sale	7. ASSETS HELD FOR SALE Certain operating markets acquired in the Progressive Waste acquisition have characteristics that are not consistent with the Company’s operating strategy and meet the held for sale criteria as of December 31, 2016 and June 30, 2017. During the six months ended June 30, 2017, the Company completed the sale of all assets and liabilities in the Washington, D.C. market in its Eastern segment for cash and non-monetary consideration totaling $25,532 . During the six months ended June 30, 2017, the Company also completed the sale of an operation in the Florida market in its Southern segment for non-monetary consideration totaling $4,500 . As of June 30, 2017, the remaining assets classified as held for sale consist of certain operating markets in the Company’s Southern segment. The assets held for sale as of June 30, 2017 have been recognized at the lower of cost or fair value less costs to sell, which resulted in recording an estimated loss on disposal of $43,873 during the six months ended June 30, 2017. The expected consideration will include cash and non-monetary assets consisting of other solid waste collection businesses. Our assets and liabilities held for sale as of June 30, 2017 and December 31, 2016, were comprised of the following:   June 30, 2017 December 31, 2016 Current assets held for sale:  Cash and equivalents $ 347 $ 42  Accounts receivable 7,405 5,726  Other current assets 979 571  $ 8,731 $ 6,339 Long-term assets held for sale:  Property and equipment $ 62,211 $ 33,624  Goodwill 17,215 244  Other assets 22 121  $ 79,448 $ 33,989 Current liabilities held for sale:  Accounts payable $ 2,789 $ 1,320  Accrued liabilities 885 1,811  Deferred revenue 2,691 252  $ 6,365 $ 3,383 Long-term liabilities held for sale:  Other liabilities $ 463 $ - 

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, Net	6 Months Ended
	Jun. 30, 2017
Goodwill and Intangible Assets, Net [Abstract]
Goodwill and Intangible Assets, Net	8 . GOODWILL AND INTANGIBLE ASSETS, NET The Company elected to early adopt the guidance issued by the FASB “Simplifying the Test for Goodwill Impairment” on January 1, 2017. As discussed in Note 3, the new guidance removes Step 2 of the goodwill impairment test, which required a hypothetical purchase price allocation. As such, the impairment analysis is only one step. In this step, the Company estimates the fair value of each of its reporting units , which consisted of five geographic operating segments and its E&P segment at June 30, 2017 , and compares the fair value with the carrying value of the net assets assigned to each reporting unit. If the fair value of a reporting unit is greater than the carrying value of the net assets, including goodwill, assigned to the reporting unit, then no impairment results. If the fair value is less than its carrying value, an impairment charge is recorded for the amount by which the carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. During the year ended December 31, 2016, the Company did not record any impairment charges related to goodwill; however, the results of the Company’s annual impairment testing indicated that the carrying value of its E&P segment exceeded its fair value by more than $77,343 , which was the carrying value of goodwill at its E&P segment at December 31, 2016. Upon adopting this accounting guidance in the first quarter of 2017, the Company performed an updated impairment test for its E&P segment. The impairment test involved measuring the recoverability of goodwill by comparing the E&P segment’s carrying amount, including goodwill, to the fair value of the reporting unit. The fair value was estimated using an income approach employing a discounted cash flow (“DCF”) model. The DCF model incorporated projected cash flows over a forecast period based on the remaining estimated lives of the operating locations comprising the E&P segment. This was based on a number of key assumptions, including, but not limited to, a discount rate of 11.7% , annual revenue projections based on E&P waste resulting from projected levels of oil and natural gas exploration and production activity during the forecast period, gross margins based on estimated operating expense requirements during the forecast period and estimated capital expenditures over the forecast period, all of which were classified as Level 3 in the fair value hierarchy. The impairment test showed the carrying value of the E&P segment continued to exceed its fair value by an amount in excess of the carrying amount of goodwill, or $77,343 . Therefore, the Company recorded an impairment charge of $77,343 , consisting of the carrying amount of goodwill at its E&P segment at January 1, 2017, to Impairments and other operating charges in the Condensed Consolidated Statements of Net Income during the six months ended June 30, 2017 .  Intangible assets, exclusive of goodwill, consisted of the following at June 30, 2017:   Gross Carrying Amount Accumulated Amortization Accumulated Impairment Loss Net Carrying Amount Finite-lived intangible assets:  Long-term franchise agreements and contracts $ 452,025 $ (103,551) $ - $ 348,474  Customer lists 387,209 (155,341) - 231,868  Permits and other 315,772 (28,719) - 287,053  1,155,006 (287,611) - 867,395  Indefinite-lived intangible assets:  Solid waste collection and transportation permits 152,761 - - 152,761  Material recycling facility permits 42,283 - - 42,283  E&P facility permits 59,855 - (38,507) 21,348  254,899 - (38,507) 216,392  Intangible assets, exclusive of goodwill $ 1,409,905 $ (287,611) $ (38,507) $ 1,083,787   The weighted-average amortization period of long-term franchise agreements and contracts acquired during the six months ended June 30, 2017 was 19.2 years. The weighted-average amortization period of customer lists acquired during the six months ended June 30, 2017 was 10.0 years. The weighted-average amortization period of finite-lived permits and other acquired during the six months ended June 30, 2017 was 40.0 years. Intangible assets, exclusive of goodwill, consisted of the following at December 31, 2016:   Gross Carrying Amount Accumulated Amortization Accumulated Impairment Loss Net Carrying Amount Finite-lived intangible assets:  Long-term franchise agreements and contracts $ 428,783 $ (86,552) $ - $ 342,231  Customer lists 371,203 (131,525) - 239,678  Permits and other 290,823 (21,966) - 268,857  1,090,809 (240,043) - 850,766 Indefinite-lived intangible assets:  Solid waste collection and transportation permits 152,761 - - 152,761  Material recycling facility permits 42,283 - - 42,283  E&P facility permits 59,855 - (38,507) 21,348  254,899 - (38,507) 216,392  Intangible assets, exclusive of goodwill $ 1,345,708 $ (240,043) $ (38,507) $ 1,067,158   Estimated future amortization expense for the next five years relating to finite-lived intangible assets is as follows:   For the year ending December 31, 2017 $ 100,344  For the year ending December 31, 2018 $ 93,108  For the year ending December 31, 2019 $ 83,147  For the year ending December 31, 2020 $ 75,471  For the year ending December 31, 2021 $ 66,754 

Long-Term Debt

Long-Term Debt	6 Months Ended
	Jun. 30, 2017
Long-Term Debt [Abstract]
Long-Term Debt	9. LONG-TERM DEBT Long-term debt consists of the following:   June 30, 2017 December 31, 2016  Revolver under Credit Agreement, bearing interest ranging from 2.18 % to 2.95 % (a) $ 256,995 $ 310,582  Term loan under Credit Agreement, bearing interest at 2.43 % (a) 1,637,500 1,637,500  2018 Notes, bearing interest at 4.00% 50,000 50,000  2019 Notes, bearing interest at 5.25 % 175,000 175,000  2021 Notes, bearing interest at 4.64% 100,000 100,000  New 2021 Notes, bearing interest at 2.39% 150,000 150,000  2022 Notes, bearing interest at 3.09% 125,000 125,000  2023 Notes, bearing interest at 2.75% 200,000 200,000  2024 Notes, bearing interest at 3.24% 150,000 -  2025 Notes, bearing interest at 3.41% 375,000 375,000  2026 Notes, bearing interest at 3.03% 400,000 400,000  2027 Notes, bearing interest at 3.49% 250,000 -  Tax-exempt bonds, bearing interest ranging from 0.97 % to 1.00 % (a) 95,430 95,430  Notes payable to sellers and other third parties, bearing interest at 2.00 % to 24.81 % (a) 26,935 14,180  3,991,860 3,632,692  Less – current portion (11,511) (1,650)  Less – debt issuance costs (16,440) (14,282)  $ 3,963,909 $ 3,616,760 ____________________ (a) Interest rates represent the interest rates incurred at June 30, 2017 .  Details of the Credit Agreement are as follows:    June 30, 2017 December 31, 2016 Revolver under Credit Agreement  Available $ 1,089,603 $ 1,004,451  Letters of credit outstanding $ 215,902 $ 247,467  Total amount drawn, as follows: $ 256,995 $ 310,582  Amount drawn – Canadian prime rate loan $ 11,559 $ 7,448  Interest rate applicable - Canadian prime rate loan 2.95% 2.95%  Amount drawn – Canadian BA loan $ 245,436 $ 303,134  Interest rate applicable – Canadian BA loan 2.18% 2.13%  Commitment – rate applicable 0.15% 0.15%  Term loan under Credit Agreement  Amount drawn – U.S. based LIBOR loan $ 1,637,500 $ 1,637,500  Interest rate applicable – U.S. based LIBOR loan 2.43% 1.97%  On April 20, 2017, pursuant to the First Supplement to Master Note Purchase Agreement with certain accredited institutional investors, the Company issued and sold to the investors $400,000 aggregate principal amount of senior unsecured notes consisting of (i) $150,000 of 3.24% series 2017A senior notes, tranche A due April 20, 2024 (the “2024 Notes”) and (ii) $250,000 of 3.49% series 2017A senior notes, tranche B due April 20, 2027 (the “2027 Notes”) (collectively, the “2017A Senior Notes”) in a private placement. The 2017A Senior Notes bear interest at fixed rates with interest payable in arrears semi-annually on the first day of October and April beginning on October 1, 2017, and on the respective maturity dates, until the principal thereunder becomes due and payable. The 2017A Senior Notes are unsecured obligations and rank pari passu with obligations under the Credit Agreement, the 2016 Senior Notes and the 2008 Notes. The 2017A Senior Notes are subject to representations, warranties, covenants and events of default. Upon the occurrence of an event of default, payment of the 2017A Senior Notes may be accelerated by the holders of the respective notes. The 2017A Senior Notes may also be prepaid by the Company at any time at par plus a make-whole amount determined in respect of the remaining scheduled interest payments on the respective notes, using a discount rate of the then current market standard for United States treasury bills plus 0.50% . In addition, the Company will be required to offer to prepay the 2017A Senior Notes upon certain changes in control. The Company intends to use the proceeds from the sale of the 2017A Senior Notes for general corporate purposes.  

Segment Reporting

Segment Reporting	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Segment Reporting	10. SEGMENT REPORTING The Company’s revenues are generated from the collection, transfer, recycling and disposal of non-hazardous solid waste and the treatment, recovery and disposal of non-hazardous E&P waste. No single contract or customer accounted for more than 10% of the Company’s total revenues at the consolidated or reportable segment level during the periods presented. The Company manages its operations through five geographic operating segments and its E&P segment , which includes the majority of the Company’s E&P waste treatment and disposal operations. The Company’s five geographic operating segments and its E&P segment comprise the Company’s reportable segments. Each operating segment is responsible for managing several vertically integrated operations, which are comprised of districts. The Company’s Southern segment services customers located in Alabama, Arkansas, Florida, Louisiana, Mississippi, southern Oklahoma, western Tennessee and Texas; the Company’s Western segment services customers located in Alaska, California, Idaho, Montana, Nevada, Oregon, Washington and western Wyoming; the Company’s Eastern segment services customers located in Illinois, Iowa, Kentucky, Maryland, Massachusetts, Michigan, New Jersey, New York, North Carolina, Pennsylvania, South Carolina, eastern Tennessee, Vermont and Wisconsin; the Company’s Canada segment services customers located in the provinces of Alberta, British Columbia, Manitoba, Ontario and Québec; and the Company’s Central segment services customers located in Arizona, Colorado, Kansas, Minnesota, Missouri, Nebraska, New Mexico, Oklahoma, South Dakota, western Texas, Utah and eastern Wyoming. The E&P segment services E&P customers located in Arkansas, Louisiana, New Mexico, North Dakota, Oklahoma, Texas, Wyoming and along the Gulf of Mexico. The Company’s Chief Operating Decision Maker (“CODM”) evaluates operating segment profitability and determines resource allocations based on several factors, of which the primary financial measure is segment EBITDA. The Company defines segment EBITDA as earnings before interest, taxes, depreciation, amortization, impairments and other operating items, other income (expense) and foreign currency transaction gain (loss). Segment EBITDA is not a measure of operating income, operating performance or liquidity under GAAP and may not be comparable to similarly titled measures reported by other companies. The Company’s management uses segment EBITDA in the evaluation of segment operating performance as it is a profit measure that is generally within the control of the operating segments. A reconciliation of segment EBITDA to Income before income tax provision is included at the end of this Note 10. Summarized financial information concerning the Company’s reportable segments for the three and six months ended June 30, 2017 and 2016, is shown in the following tables:  Three Months Ended June 30, 2017 Revenue Intercompany Revenue (b) Reported Revenue Segment EBITDA (c)  Southern $ 323,108 $ (37,725) $ 285,383 $ 67,168  Western 288,953 (31,461) 257,492 87,045  Eastern 292,327 (46,017) 246,310 72,095  Canada 206,629 (26,332) 180,297 66,365  Central 182,781 (23,363) 159,418 60,716  E&P 48,677 (2,008) 46,669 21,092  Corporate (a) - - - (11,162)  $ 1,342,475 $ (166,906) $ 1,175,569 $ 363,319   Three Months Ended June 30, 2016 Revenue Intercompany Revenue (b) Reported Revenue Segment EBITDA (c)  Southern $ 137,169 $ (16,618) $ 120,551 $ 27,228  Western 265,911 (29,480) 236,431 79,835  Eastern 168,824 (26,240) 142,584 44,824  Canada 70,103 (9,518) 60,585 23,555  Central 157,997 (18,327) 139,670 52,578  E&P 31,002 (3,184) 27,818 6,485  Corporate (a) - - - (75,865)  $ 831,006 $ (103,367) $ 727,639 $ 158,640   Six Months Ended June 30, 2017 Revenue Intercompany Revenue (b) Reported Revenue Segment EBITDA (c)  Southern $ 640,447 $ (74,942) $ 565,505 $ 136,108  Western 552,954 (59,872) 493,082 162,613  Eastern 565,624 (87,827) 477,797 137,546  Canada 391,960 (48,627) 343,333 123,665  Central 346,593 (42,866) 303,727 113,368  E&P 87,743 (4,352) 83,391 35,637  Corporate (a) - - - (26,783)  $ 2,585,321 $ (318,486) $ 2,266,835 $ 682,154   Six Months Ended June 30, 2016 Revenue Intercompany Revenue (b) Reported Revenue Segment EBITDA (c)  Southern $ 180,135 $ (22,665) $ 157,470 $ 36,717  Western 512,775 (57,111) 455,664 153,625  Eastern 297,040 (46,660) 250,380 79,438  Canada 70,103 (9,518) 60,585 23,555  Central 291,895 (32,288) 259,607 96,431  E&P 64,098 (5,485) 58,613 13,034  Corporate (a) - - - (84,353)  $ 1,416,046 $ (173,727) $ 1,242,319 $ 318,447 ____________________ (a) 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. (b) 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. (c) 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.  Total assets for each of the Company’s reportable segments at June 30, 2017 and December 31, 2016, were as follows:    June 30, 2017 December 31, 2016  Southern $ 2,801,661 $ 2,869,841  Western 1,518,397 1,516,870  Eastern 1,944,737 1,541,854  Canada 2,583,098 2,532,046  Central 1,304,610 1,302,900  E&P 986,957 1,068,086  Corporate 515,903 272,328  Total Assets $ 11,655,363 $ 11,103,925  The following tables show changes in goodwill during the six months ended June 30, 2017 and 2016, by reportable segment:      Southern Western Eastern Canada Central E&P Total  Balance as of December 31, 2016 $ 1,470,023 $ 376,537 $ 533,160 $ 1,465,274 $ 467,924 $ 77,343 $ 4,390,261  Goodwill acquired 10,335 - 249,724 7,128 711 - 267,898  Impairment loss - - - - - (77,343) (77,343)  Goodwill adjustment for assets sold 2,205 - 321 - - - 2,526  Impairment loss related to assets held for sale (27,311) - - - - - (27,311)  Goodwill reclassified as assets held for sale (17,215) - - - - - (17,215)  Impact of changes in foreign currency - - - 50,757 - - 50,757  Balance as of June 30, 2017 $ 1,438,037 $ 376,537 $ 783,205 $ 1,523,159 $ 468,635 $ - $ 4,589,573     Southern Western Eastern Canada Central E&P Total  Balance as of December 31, 2015 $ 95,710 $ 373,820 $ 459,532 $ - $ 416,420 $ 77,343 $ 1,422,825  Goodwill acquired 1,241,419 2,673 70,723 1,510,220 42,113 - 2,867,148  Impact of changes in foreign currency - - - 9,490 - - 9,490  Balance as of June 30, 2016 $ 1,337,129 $ 376,493 $ 530,255 $ 1,519,710 $ 458,533 $ 77,343 $ 4,299,463   A reconciliation of the Company’s primary measure of segment profitability (segment EBITDA) to Income before income tax provision in the Condensed Consolidated Statements of Net Income is as follows:   Three months ended June 30, Six months ended June 30,  2017 2016 2017 2016  Southern segment EBITDA $ 67,168 $ 27,228 $ 136,108 $ 36,717  Western segment EBITDA 87,045 79,835 162,613 153,625  Eastern segment EBITDA 72,095 44,824 137,546 79,438  Canada segment EBITDA 66,365 23,555 123,665 23,555  Central segment EBITDA 60,716 52,578 113,368 96,431  E&P segment EBITDA 21,092 6,485 35,637 13,034  Subtotal reportable segments 374,481 234,505 708,937 402,800  Unallocated corporate overhead (11,162) (75,865) (26,783) (84,353)  Depreciation (132,827) (84,348) (258,067) (145,245)  Amortization of intangibles (24,762) (14,081) (50,272) (21,775)  Impairments and other operating items 1,180 3,284 (140,501) 3,048  Interest expense (31,160) (20,485) (60,291) (37,670)  Other income (expense), net 1,860 (714) 3,326 (492)  Foreign currency transaction gain (loss) (1,048) 689 (1,638) 689  Income before income tax provision $ 176,562 $ 42,985 $ 174,711 $ 117,002  The following tables reflect a breakdown of the Company’s revenue and inter-company eliminations for the periods indicated:   Three months ended June 30, 2017  Revenue Intercompany Revenue Reported Revenue % of Reported Revenue  Solid waste collection $ 797,131 $ (2,392) $ 794,739 67.6%  Solid waste disposal and transfer 416,176 (158,937) 257,239 21.9  Solid waste recycling 43,693 (2,351) 41,342 3.5  E&P waste treatment, recovery and disposal 50,043 (2,870) 47,173 4.0  Intermodal and other 35,432 (356) 35,076 3.0  Total $ 1,342,475 $ (166,906) $ 1,175,569 100.0%    Three months ended June 30, 2016  Revenue Intercompany Revenue Reported Revenue % of Reported Revenue  Solid waste collection $ 502,948 $ (1,778) $ 501,170 68.9%  Solid waste disposal and transfer 256,847 (96,815) 160,032 22.0  Solid waste recycling 18,119 (1,393) 16,726 2.3  E&P waste treatment, recovery and disposal 30,734 (3,253) 27,481 3.8  Intermodal and other 22,358 (128) 22,230 3.0  Total $ 831,006 $ (103,367) $ 727,639 100.0%    Six months ended June 30, 2017  Revenue Intercompany Revenue Reported Revenue % of Reported Revenue  Solid waste collection $ 1,565,478 $ (4,592) $ 1,560,886 68.9%  Solid waste disposal and transfer 773,201 (302,378) 470,823 20.8  Solid waste recycling 87,581 (4,935) 82,646 3.6  E&P waste treatment, recovery and disposal 89,864 (5,838) 84,026 3.7  Intermodal and other 69,197 (743) 68,454 3.0  Total $ 2,585,321 $ (318,486) $ 2,266,835 100.0%    Six months ended June 30, 2016  Revenue Intercompany Revenue Reported Revenue % of Reported Revenue  Solid waste collection $ 859,546 $ (3,099) $ 856,447 68.9%  Solid waste disposal and transfer 426,929 (162,849) 264,080 21.3  Solid waste recycling 28,738 (2,031) 26,707 2.1  E&P waste treatment, recovery and disposal 63,586 (5,620) 57,966 4.7  Intermodal and other 37,247 (128) 37,119 3.0  Total $ 1,416,046 $ (173,727) $ 1,242,319 100.0% 

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2017
Derivative Financial Instruments [Abstract]
Derivative Financial Instruments	11. DERIVATIVE FINANCIAL INSTRUMENTS The Company recognizes all derivatives on the Condensed Consolidated Balance Sheet at fair value. All of the Company’s derivatives have been designated as cash flow hedges; therefore, the effective portion of the changes in the fair value of derivatives will be recognized in accumulated other comprehensive income (loss) (“AOCIL”) until the hedged item is recognized in earnings. The ineffective portion of the changes in the fair value of derivatives will be immediately recognized in earnings. The Company classifies cash inflows and outflows from derivatives within operating activities on the Condensed Consolidated Statements of Cash Flows. One of the Company’s objectives for utilizing derivative instruments is to reduce its exposure to fluctuations in cash flows due to changes in the variable interest rates of certain borrowings issued under its Credit Agreement. The Company’s strategy to achieve that objective involves entering into interest rate swaps. The interest rate swaps outstanding at June 30, 2017 were specifically designated to the Credit Agreement and accounted for as cash flow hedges. At June 30, 2017, the Company’s derivative instruments included 11 interest rate swap agreements as follows:   Date Entered Notional Amount Fixed Interest Rate Paid* Variable Interest Rate Received Effective Date Expiration Date  April 2014 $ 100,000 1.800% 1-month LIBOR July 2014 July 2019  May 2014 $ 50,000 2.344% 1-month LIBOR October 2015 October 2020  May 2014 $ 25,000 2.326% 1-month LIBOR October 2015 October 2020  May 2014 $ 50,000 2.350% 1-month LIBOR October 2015 October 2020  May 2014 $ 50,000 2.350% 1-month LIBOR October 2015 October 2020  April 2016 $ 100,000 1.000% 1-month LIBOR February 2017 February 2020  June 2016 $ 75,000 0.850% 1-month LIBOR February 2017 February 2020  June 2016 $ 150,000 0.950% 1-month LIBOR January 2018 January 2021  June 2016 $ 150,000 0.950% 1-month LIBOR January 2018 January 2021  July 2016 $ 50,000 0.900% 1-month LIBOR January 2018 January 2021  July 2016 $ 50,000 0.890% 1-month LIBOR January 2018 January 2021 ____________________ * Plus applicable margin. Another of the Company’s objectives for utilizing derivative instruments is to reduce its exposure to fluctuations in cash flows due to changes in the price of diesel fuel. The Company’s strategy to achieve that objective involves periodically entering into fuel hedges that are specifically designated to certain forecasted diesel fuel purchases and accounted for as cash flow hedges. At June 30, 2017, the Company’s derivative instruments included four fuel hedge agreements as follows:  Date Entered Notional Amount (in gallons per month) Diesel Rate Paid Fixed (per gallon) Diesel Rate Received Variable Effective Date Expiration Date  May 2015 300,000 $3.2800 DOE Diesel Fuel Index* January 2016 December 2017  May 2015 200,000 $3.2750 DOE Diesel Fuel Index* January 2016 December 2017  July 2016 500,000 $2.4988 DOE Diesel Fuel Index* January 2017 December 2017  July 2016 1,000,000 $2.6345 DOE Diesel Fuel Index* January 2018 December 2018 ____________________ * If the national U.S. on-highway average price for a gallon of diesel fuel (“average price”), as published by the U.S. Department of Energy (“DOE”), exceeds the contract price per gallon, the Company receives the difference between the average price and the contract price (multiplied by the notional number of gallons) from the counterparty. If the average price is less than the contract price per gallon, the Company pays the difference to the counterparty.  The fair values of derivative instruments designated as cash flow hedges as of June 30, 2017, were as follows:   Derivatives Designated as Cash Asset Derivatives Liability Derivatives Flow Hedges Balance Sheet Location Fair Value Balance Sheet Location Fair Value  Interest rate swaps Prepaid expenses and other current assets (a) $ 1,428 Accrued liabilities (a) $ (2,411)  Other assets, net 11,068 Other long-term liabilities (1,781)   Fuel hedges Prepaid expenses and other current assets (b) 103 Accrued liabilities (b) (2,606)  Other long-term liabilities (174)  Total derivatives designated as cash flow hedges $ 12,599 $ (6,972) ____________________ (a) Represents the estimated amount of the existing unrealized gains and losses, respectively, on interest rate swaps as of June 30, 2017 (based on the interest rate yield curve at that date), included in AOCIL expected to be reclassified into pre-tax earnings within the next 12 months. The actual amounts reclassified into earnings are dependent on future movements in interest rates. (b) Represents the estimated amount of the existing unrealized gains and losses, respectively, on fuel hedges as of June 30, 2017 (based on the forward DOE diesel fuel index curve at that date), included in AOCIL expected to be reclassified into pre-tax earnings within the next 12 months. The actual amounts reclassified into earnings are dependent on future movements in diesel fuel prices.  The fair values of derivative instruments designated as cash flow hedges as of December 31, 2016, were as follows:  Derivatives Designated as Cash Asset Derivatives Liability Derivatives Flow Hedges Balance Sheet Location Fair Value Balance Sheet Location Fair Value  Interest rate swaps Prepaid expenses and other current assets $ 127 Accrued liabilities $ (3,260)  Other assets, net 13,822 Other long-term liabilities (2,350)   Fuel hedges Prepaid expenses and other current assets 1,343 Accrued liabilities (3,258)  Other assets, net 1,651  Total derivatives designated as cash flow hedges $ 16,943 $ (8,868)   The following table summarizes the impact of the Company’s cash flow hedges on the results of operations, comprehensive income (loss) and AOCIL for the three and six months ended June 30, 2017 and 2016:  Derivatives Designated as Cash Flow Hedges Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax (Effective Portion) (a) Statement of Net Income Classification Amount of (Gain) or Loss Reclassified from AOCIL into Earnings, Net of Tax (Effective Portion) (b),(c)  Three Months Ended June 30, Three Months Ended June 30,  2017 2016 2017 2016  Interest rate swaps $ (4,098) $ (2,352) Interest expense $ 558 $ 1,047  Fuel hedges (720) 1,017 Cost of operations 626 911  Total $ (4,818) $ (1,335) $ 1,184 $ 1,958   Derivatives Designated as Cash Flow Hedges Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax (Effective Portion) (a) Statement of Net Income Classification Amount of (Gain) or Loss Reclassified from AOCIL into Earnings, Net of Tax (Effective Portion) (b),(c)  Six Months Ended June 30, Six Months Ended June 30,  2017 2016 2017 2016  Interest rate swaps $ (1,379) $ (6,493) Interest expense $ 1,353 $ 2,105  Fuel hedges (2,714) 210 Cost of operations 1,222 2,025  Total $ (4,093) $ (6,283) $ 2,575 $ 4,130 ___________________ (a) In accordance with the derivatives and hedging guidance, the effective portions of the changes in fair values of interest rate swaps and fuel hedges have been recorded in equity as a component of AOCIL. As the critical terms of the interest rate swaps match the underlying debt being hedged, no ineffectiveness is recognized on these swaps and, therefore, all unrealized changes in fair value are recorded in AOCIL. Because changes in the actual price of diesel fuel and changes in the DOE index price do not offset exactly each reporting period, the Company assesses whether the fuel hedges are highly effective using the cumulative dollar offset approach. (b) Amounts reclassified from AOCIL into earnings related to realized gains and losses on interest rate swaps are recognized when interest payments or receipts occur related to the swap contracts, which correspond to when interest payments are made on the Company’s hedged debt. (c) Amounts reclassified from AOCIL into earnings related to realized gains and losses on the fuel hedges are recognized when settlement payments or receipts occur related to the hedge contracts, which correspond to when the underlying fuel is consumed. The Company measures and records ineffectiveness on the fuel hedges in Cost of operations in the Condensed Consolidated Statements of Net Income on a monthly basis based on the difference between the DOE index price and the actual price of diesel fuel purchased, multiplied by the notional number of gallons on the contracts. There was no significant ineffectiveness recognized on the fuel hedges during the six months ended June 30, 2017 and 2016. See Note 15 for further discussion on the impact of the Company’s hedge accounting to its consolidated comprehensive income (loss) and AOCIL. 

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2017
Fair Value [Abstract]
Fair Value of Financial Instruments	12. FAIR VALUE OF FINANCIAL INSTRUMENTS The Company’s financial instruments consist primarily of cash and equivalents, trade receivables, restricted assets, trade payables, debt instruments, contingent consideration obligations, interest rate swaps and fuel hedges. As of June 30, 2017 and December 31, 2016, the carrying values of cash and equivalents, trade receivables, restricted assets, trade payables and contingent consideration are considered to be representative of their respective fair values. The carrying values of the Company’s debt instruments, excluding certain notes as listed in the table below, approximate their fair values as of June 30, 2017 and December 31, 2016, based on current borrowing rates, current remaining average life to maturity and borrower credit quality for similar types of borrowing arrangements, and are classified as Level 2 within the fair value hierarchy. The carrying values and fair values of the Company’s debt instruments where the carrying values do not approximate their fair values as of June 30, 2017 and December 31, 2016, are as follows:   Carrying Value at Fair Value* at  June 30, 2017 December 31, 2016 June 30, 2017 December 31, 2016  4.00% Senior Notes due 2018 $ 50,000 $ 50,000 $ 50,734 $ 51,226  5.25% Senior Notes due 2019 $ 175,000 $ 175,000 $ 186,411 $ 187,671  4.64% Senior Notes due 2021 $ 100,000 $ 100,000 $ 106,979 $ 106,618  2.39% Senior Notes due 2021 $ 150,000 $ 150,000 $ 148,267 $ 146,168  3.09% Senior Notes due 2022 $ 125,000 $ 125,000 $ 126,099 $ 123,974  2.75% Senior Notes due 2023 $ 200,000 $ 200,000 $ 196,690 $ 192,238  3.24% Senior Notes due 2024 $ 150,000 $ - $ 150,597 $ -  3.41% Senior Notes due 2025 $ 375,000 $ 375,000 $ 378,842 $ 368,968  3.03% Senior Notes due 2026 $ 400,000 $ 400,000 $ 391,387 $ 379,438  3.49% Senior Notes due 2027 $ 250,000 $ - $ 251,601 $ - ______________________ * Senior Notes are classified as Level 2 within the fair value hierarchy. Fair value is based on quotes of bonds with similar ratings in similar industries. For details on the fair value of the Company’s interest rate swaps, fuel hedges, restricted assets and contingent consideration, refer to Note 14. 

Net Income Per Share Informatio

Net Income Per Share Information	6 Months Ended
	Jun. 30, 2017
Net Income Per Share Information [Abstract]
Net Income Per Share Information	13. NET INCOME PER SHARE INFORMATION The following table sets forth the calculation of the numerator and denominator used in the computation of basic and diluted net income per common share attributable to the Company’s shareholders for the three and six months ended June 30, 2017 and 2016:   Three months ended June 30, Six months ended June 30,  2017 2016 2017 2016 Numerator:  Net income attributable to Waste Connections for basic and diluted earnings per share $ 123,656 $ 27,489 $ 138,530 $ 72,331  Denominator:  Basic shares outstanding 263,387,338 210,305,335 263,225,541 197,244,873  Dilutive effect of equity-based awards 722,256 575,397 781,766 791,919  Diluted shares outstanding 264,109,594 210,880,732 264,007,307 198,036,792  

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2017
Fair Value [Abstract]
Fair Value Measurements	14. FAIR VALUE MEASUREMENTS The Company uses a three-tier fair value hierarchy to classify and disclose all assets and liabilities measured at fair value on a recurring basis in periods subsequent to their initial measurement. These tiers include: Level 1, defined as quoted market prices in active markets for identical assets or liabilities; Level 2, defined as inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, model-based valuation techniques for which all significant assumptions are observable in the market, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and Level 3, defined as unobservable inputs that are not corroborated by market data. The Company’s financial assets and liabilities recorded at fair value on a recurring basis include derivative instruments and restricted assets. The Company’s derivative instruments are pay-fixed, receive-variable interest rate swaps and pay-fixed, receive-variable diesel fuel hedges. The Company’s interest rate swaps are recorded at their estimated fair values based on quotes received from financial institutions that trade these contracts. The Company verifies the reasonableness of these quotes using similar quotes from another financial institution as of each date for which financial statements are prepared. The Company uses a discounted cash flow (“DCF”) model to determine the estimated fair value of the diesel fuel hedges. The assumptions used in preparing the DCF model include: (i) estimates for the forward DOE index curve; and (ii) the discount rate based on risk-free interest rates over the term of the hedge contracts. The DOE index curve used in the DCF model was obtained from financial institutions that trade these contracts and ranged from $2.51 to $2.62 at June 30, 2017 and from $2.61 to $2.78 at December 31, 2016. The weighted average DOE index curve used in the DCF model was $2.57 and $2.75 at June 30, 2017 and December 31, 2016, respectively. Significant increases (decreases) in the forward DOE index curve would result in a significantly higher (lower) fair value measurement. For the Company’s interest rate swaps and fuel hedges, the Company also considers the Company’s creditworthiness in its determination of the fair value measurement of these instruments in a net liability position and the counterparties’ creditworthiness in its determination of the fair value measurement of these instruments in a net asset position. The Company’s restricted assets are valued at quoted market prices in active markets for similar assets, which the Company receives from the financial institutions that hold such investments on its behalf. The Company’s restricted assets measured at fair value are invested primarily in U.S. government and agency securities and Canadian bankers’ acceptance notes. The Company’s assets and liabilities measured at fair value on a recurring basis at June 30, 2017 and December 31, 2016, were as follows:   Fair Value Measurement at June 30, 2017 Using  Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3)  Interest rate swap derivative instruments – net asset position $ 8,304 $ - $ 8,304 $ -  Fuel hedge derivative instruments – net liability position $ (2,677) $ - $ - $ (2,677)  Restricted assets $ 58,985 $ - $ 58,985 $ -  Contingent consideration $ (58,315) $ - $ - $ (58,315)    Fair Value Measurement at December 31, 2016 Using  Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3)  Interest rate swap derivative instruments – net asset position $ 8,339 $ - $ 8,339 $ -  Fuel hedge derivative instrument – net liability position $ (264) $ - $ - $ (264)  Restricted assets $ 57,166 $ - $ 57,166 $ -  Contingent consideration $ (51,826) $ - $ - $ (51,826)  The following table summarizes the changes in the fair value for Level 3 derivatives for the six months ended June 30, 2017 and 2016:    Six Months Ended June 30,  2017 2016  Beginning balance $ (264) $ (9,900)  Realized losses included in earnings 1,976 3,274  Unrealized (gains) losses included in AOCIL (4,389) 324  Ending balance $ (2,677) $ (6,302)   The following table summarizes the changes in the fair value for Level 3 liabilities related to contingent consideration for the six months ended June 30, 2017 and 2016:   Six Months Ended June 30,  2017 2016  Beginning balance $ 51,826 $ 49,394  Contingent consideration recorded at acquisition date 15 13,110  Payment of contingent consideration recorded at acquisition date (5,565) (4,109)  Payment of contingent consideration recorded in earnings - (132)  Adjustments to contingent consideration 11,013 (2,495)  Interest accretion expense 1,026 756  Ending balance $ 58,315 $ 56,524   

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	6 Months Ended
	Jun. 30, 2017
Other Comprehensive Income (Loss) [Abstract]
Other Comprehensive Income (Loss)	15. OTHER COMPREHENSIVE INCOME (LOSS) O ther comprehensive income (loss) includes changes in the fair value of interest rate swaps and fuel hedges that qualify for hedge accounting. The components of other comprehensive income (loss) and related tax effects for the three and six month periods ended June 30, 2017 and 2016 are as follows:   Three months ended June 30, 2017  Gross Tax effect Net of tax  Interest rate swap amounts reclassified into interest expense $ 760 $ (202) $ 558  Fuel hedge amounts reclassified into cost of operations 1,012 (386) 626  Changes in fair value of interest rate swaps (2,904) (1,194) (4,098)  Changes in fair value of fuel hedges (1,164) 444 (720)  Foreign currency translation adjustment 53,193 - 53,193  $ 50,897 $ (1,338) $ 49,559     Three months ended June 30, 2016  Gross Tax effect Net of tax  Interest rate swap amounts reclassified into interest expense $ 1,693 $ (646) $ 1,047  Fuel hedge amounts reclassified into cost of operations 1,473 (562) 911  Changes in fair value of interest rate swaps (3,826) 1,474 (2,352)  Changes in fair value of fuel hedges 1,629 (612) 1,017  Foreign currency translation adjustment 12,651 - 12,651  $ 13,620 $ (346) $ 13,274     Six months ended June 30, 2017  Gross Tax effect Net of tax  Interest rate swap amounts reclassified into interest expense $ 1,841 $ (488) $ 1,353  Fuel hedge amounts reclassified into cost of operations 1,976 (754) 1,222  Changes in fair value of interest rate swaps (1,876) 497 (1,379)  Changes in fair value of fuel hedges (4,389) 1,675 (2,714)  Foreign currency translation adjustment 70,627 - 70,627  $ 68,179 $ 930 $ 69,109     Six months ended June 30, 2016  Gross Tax effect Net of tax  Interest rate swap amounts reclassified into interest expense $ 3,403 $ (1,298) $ 2,105  Fuel hedge amounts reclassified into cost of operations 3,274 (1,249) 2,025  Changes in fair value of interest rate swaps (10,514) 4,021 (6,493)  Changes in fair value of fuel hedges 324 (114) 210  Foreign currency translation adjustment 12,651 - 12,651  $ 9,138 $ 1,360 $ 10,498   A rollforward of the amounts included in AOCIL, net of taxes, for the six months ended June 30, 2017 and 2016, is as follows:   Fuel Hedges Interest Rate Swaps Foreign Currency Translation Adjustment Accumulated Other Comprehensive Income ( Loss )  Balance at December 31, 2016 $ (164) $ 8,094 $ (50,931) $ (43,001)  Amounts reclassified into earnings 1,222 1,353 - 2,575  Changes in fair value (2,714) (1,379) - (4,093)  Foreign currency translation adjustment - - 70,627 70,627  Balance at June 30, 2017 $ (1,656) $ 8,068 $ 19,696 $ 26,108  .   Fuel Hedges Interest Rate Swaps Foreign Currency Translation Adjustment Accumulated Other Comprehensive Income ( Loss )  Balance at December 31, 2015 $ (6,134) $ (6,037) $ - $ (12,171)  Amounts reclassified into earnings 2,025 2,105 - 4,130  Changes in fair value 210 (6,493) - (6,283)  Foreign currency translation adjustment - - 12,651 12,651  Balance at June 30, 2016 $ (3,899) $ (10,425) $ 12,651 $ (1,673)  See Note 11 for further discussion on the Company’s derivative instruments.

Shareholders' Equity

Shareholders' Equity	6 Months Ended
	Jun. 30, 2017
Shareholders' Equity [Abstract]
Shareholders' Equity	16. SHAREHOLDERS' EQUITY Share split On April 26, 2017, the Company announced that its Board of Directors approved a split of its common shares on a three -for-two basis, which was approved by its shareholders at the Company’s Annual and Special Meeting of Shareholders of Waste Connections on May 23, 2017. Shareholders of record on June 7, 2017 received from the Company’s transfer agent on June 16, 2017, one additional common share for every two common shares held. All share and per share amounts for all periods presented have been retroactively adjusted to reflect the share split. Share-Based Compensation Restricted Share Units – New Waste Connections A summary of activity related to restricted share units (“RSUs”) during the six-month period ended June 30, 2017, is presented below:   Unvested Shares  Outstanding at December 31, 2016 1,252,291  Granted 413,179  Forfeited (26,483)  Vested and issued (534,881)  Vested and deferred (34,033)  Outstanding at June 30, 2017 1,070,073   The weighted average grant-date fair value per share for the common shares underlying the RSUs granted during the six-month period ended June 30, 2017 was $56.99 . Recipients of the Company’s RSUs who participate in the Company’s Nonqualified Deferred Compensation Plan may have elected in years prior to 2015 to defer some or all of their RSUs as they vest until a specified date or dates they choose. At the end of the deferral periods, the Company issues to recipients who deferred their RSUs common shares of the Company underlying the deferred RSUs. At June 30, 2017 and 2016, the Company had 352,263 and 366,337 vested deferred RSUs outstanding, respectively. Performance-Based Restricted Share Units – New Waste Connections A summary of activity related to performance-based restricted share units (“PSUs”) during the six-month period ended June 30, 2017, is presented below:   Unvested Shares  Outstanding at December 31, 2016 427,144  Granted 210,103  Vested and issued (122,786)  Outstanding at June 30, 2017 514,461   During the six months ended June 30, 2017, the Compensation Committee granted PSUs with three -year performance-based metrics that the Company must meet before those awards may be earned, and the performance period for those grants ends on December 31, 2019 . During the same period, the Compensation Committee also granted PSUs with a one -year performance-based metric that the Company must meet before those awards may be earned, with the awards then subject to time-based vesting for the remaining three years of their four -year vesting period. The Compensation Committee will determine the achievement of performance results and corresponding vesting of PSUs for each performance period. The weighted average grant-date fair value per share for the common shares underlying all PSUs granted during the six-month period ended June 30, 2017 was $57.47 . Deferred Share Units – New Waste Connections and Progressive Waste Plans A summary of activity related to deferred share units (“DSUs”) during the six-month period ended June 30, 2017, is presented below:   Vested Shares  Outstanding at December 31, 2016 68,942  Granted 4,725  Share settled (35,416)  Cash settled (25,113)  Outstanding at June 30, 2017 13,138   Restricted Share Units - Progressive Waste Plans The Progressive Waste share-based compensation plans were continued by the Company following the Progressive Waste acquisition and allow for the issuance of shares or cash settlement to employees upon vesting of restricted share units (“RSUs”). A summary of activity related to Progressive Waste RSUs during the six-month period ended June 30, 2017, is presented below:   Outstanding at December 31, 2016 269,233  Cash settled (65,211)  Outstanding at June 30, 2017 204,022  A summary of vesting activity related to Progressive Waste RSUs during the six-month period ended June 30, 2017, is presented below:   Vested at December 31, 2016 222,517  Vested over remaining service period 13,373  Cash settled (65,211)  Vested at June 30, 2017 170,679  No RSUs under the Progressive Waste share-based compensation plans were granted subsequent to June 1, 2016. Performance-Based Restricted Share Units - Progressive Waste Plans The Progressive Waste share-based compensation plans were continued by the Company following the Progressive Waste acquisition and allow for cash settlement only to employees upon vesting of performance-based restricted share units (“PSUs”) based on achieving target results. A summary of activity related to Progressive Waste PSUs during the six-month period ended June 30, 2017, is presented below:   Outstanding at December 31, 2016 92,957  Cash settled, net of notional dividend (37,164)  Outstanding at June 30, 2017 55,793  A summary of vesting activity related to Progressive Waste PSUs during the six-month period ended June 30, 2017, is presented below:   Vested at December 31, 2016 35,727  Vested over remaining service period 8,042  Cash settled, net of notional dividend (37,164)  Vested at June 30, 2017 6,605  No PSUs under the Progressive Waste share-based compensation plans were granted subsequent to June 1, 2016. Share Based Options – Progressive Waste Plans The Progressive Waste share-based compensation plans were continued by the Company following the Progressive Waste acquisition and allow for the issuance of shares or cash settlement to employees upon vesting of share based options. A summary of activity related to Progressive Waste share based options during the six-month period ended June 30, 2017, is presented below:   Outstanding at December 31, 2016 672,996  Share settled (33,792)  Cash settled (322,785)  Forfeited (9,662)  Outstanding at June 30, 2017 306,757  A summary of vesting activity related to Progressive Waste share based options during the six-month period ended June 30, 2017, is presented below:   Vested at December 31, 2016 601,395  Vested over remaining service period 71,601  Share settled (33,792)  Cash settled (322,785)  Forfeited (9,662)  Vested at June 30, 2017 306,757  No share based options under the Progressive Waste share-based compensation plans were granted subsequent to June 1, 2016. Normal Course Issuer Bid On July 19, 2016, the Board of Directors of the Company approved, subject to receipt of regulatory approvals, undertaking a normal course issuer bid (the “NCIB”) to purchase up to 13,156,098 (after giving effect to the three-for-two share split) of the Company’s common shares for a one -year period that expires on August 7, 2017 . The Company received TSX approval of the NCIB on August 3, 2016. Under the NCIB, the Company may make share repurchases only in the open market, including on the NYSE, the TSX, and alternative Canadian trading systems, at the prevailing market price at the time of the transaction. In accordance with TSX rules, any daily repurchases made through the TSX and alternative Canadian trading systems would be limited to a maximum of 90,225 common shares (after giving effect to the three-for-two share split), which represents 25% of the average daily trading volume on the TSX of 360,901 common shares (after giving effect to the three-for-two share split) for the period from June 1, 2016 to July 31, 2016, being the whole calendar month periods that the Company's shares traded on the TSX from the June 1, 2016 closing of the Progressive Waste acquisition to the date the Company filed its NCIB application with the TSX. The TSX rules also allow the Company to purchase, once a week, a block of common shares not owned by any insiders, which may exceed such daily limit. The maximum number of shares that can be purchased per day on the NYSE will be 25% of the average daily trading volume for the four calendar weeks preceding the date of purchase, subject to certain exceptions for block purchases. The timing and amounts of any repurchases pursuant to the NCIB will depend on many factors, including the Company’s capital structure, the market price of the common shares and overall market conditions. All common shares purchased under the NCIB shall be immediately cancelled following their repurchase. For the six months ended June 30, 2017, the Company did not repurchase any common shares pursuant to the NCIB. For the six months ended June 30, 2016, the Company did not repurchase any common shares pursuant to the NCIB nor did Old Waste Connections repurchase shares of its common stock pursuant to its share repurchase program . Cash Dividend In October 2016, the Company announced that its Board of Directors increased its regular quarterly cash dividend by $0.023 , from $0.097 to $0.12 per share. Dividend amounts reflect the post-split basis of the three-for-two share split completed in June 2017. Cash dividends of $63,463 and $35,585 were paid during the six months ended June 30, 2017 and 2016, respectively.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies [Abstract]
Commitments and Contingencies	17. COMMITMENTS AND CONTINGENCIES In the normal course of its business and as a result of the extensive governmental regulation of the solid waste and E&P waste industries, the Company is subject to various judicial and administrative proceedings involving Canadian regulatory authorities as well as U.S. federal, state and local agencies. In these proceedings, an agency may seek to impose fines on the Company or to revoke or deny renewal of an authorization held by the Company, including an operating permit. From time to time, the Company may also be subject to actions brought by special interest or other groups, adjacent landowners or residents in connection with the permitting and licensing of landfills, transfer stations, and E&P waste treatment, recovery and disposal operations, or alleging environmental damage or violations of the permits and licenses pursuant to which the Company operates. In addition, the Company is a party to various claims and suits pending for alleged damages to persons and property, alleged violations of certain laws and alleged liabilities arising out of matters occurring during the normal operation of the waste management business. Except as noted in the matters described below, as of June 30, 2017, there is no current proceeding or litigation involving the Company or its property that the Company believes could have a material adverse impact on its business, financial condition, results of operations or cash flows. Lower Duwamish Waterway Superfund Site Allocation Process The Company’s subsidiary, Northwest Container Services, Inc. (“NWCS”), has been named by the U.S. Environmental Protection Agency, Region 10 (the “EPA”) as a potentially responsible party (“PRP”), along with more than 100 others, under the Comprehensive Environmental Response, Compensation and Liability Act (“CERCLA” or the “Superfund” law) with respect to the Lower Duwamish Waterway Superfund Site (the “LDW Site”). Listed on the National Priorities List in 2001, the LDW Site is a five-mile stretch of the Duwamish River flowing into Elliott Bay in Seattle, Washington. A group of PRPs known as the Lower Duwamish Working Group (“LDWG”) and consisting of the City of Seattle, King County, the Port of Seattle, and Boeing Company conducted a Remedial Investigation/Feasibility Study for the LDW Site. On December 2, 2014, the EPA issued its Record of Decision (the “ROD”) describing the selected clean-up remedy, and therein estimated that clean-up costs (in present value dollars as of November 2014) should total about $342,000 . However, it is possible that additional costs could be incurred based upon various factors. The EPA estimates that it will take seven years to implement the clean-up. The ROD also requires ten years of monitoring following the clean-up, and provides that if clean-up goals have not been met by the end of this period, then additional clean-up activities, at additional cost, may be required at that time. Implementation of the clean-up will not begin until after the ongoing Early Action Area (“EAA”) clean-ups have been completed. Typically, costs for monitoring may be in addition to those expended for the clean-up. While three of the EAA clean-ups have been completed to date, some work remains to be done on three other EAAs. Implementation of the clean-up also must await additional baseline sampling throughout the LDW Site and the preparation of a remedial design for performing the clean-up. On April 27, 2016, the LDWG entered into a third amendment of its Administrative Order on Consent with the EPA (the “AOC 3”) in which it agreed to perform the additional baseline sediment sampling and certain technical studies needed to prepare the actual remedial design. On November 9, 2016, the EPA and the Washington State Department of Ecology (“Ecology”) conducted a public stakeholder meeting regarding the LDW Site. During the public stakeholder meeting, the EPA provided an overview of the AOC 3 pre-remedial design work and the progress of the on-going work on the EAA cleanups. At the meeting, both the EPA and Ecology estimated that the pre-design studies being performed pursuant to the AOC 3 would not be completed until the end of 2019. The EPA and Ecology did not revise that estimate at the EPA stakeholder meeting on June 14, 2017. In August 2014, NWCS entered into an Alternative Dispute Resolution Memorandum of Agreement with several dozen other PRPs and a neutral allocator to conduct a confidential and non-binding allocation of certain past response costs allegedly incurred at the LDW Site as well as the anticipated future response costs associated with the clean-up. The allocation process is designed to develop evidence relating to each PRP’s nexus, if any, to the LDW Site (regardless of whether that PRP is participating in the allocation process), and to determine each PRP’s share of the past and future response costs. The goal of the allocation process is to reach agreement on a division of responsibility between and amongst the PRPs so that the PRPs then will be in a position to negotiate a global settlement with the EPA. On August 16, 2016, the EPA sent individual letters to each of the PRPs at the LDW Site, including NWCS, stating that it expects to initiate negotiations with all PRPs in early 2018 relating to a Remedial Design/Remedial Action (“RD/RA”) Consent Decree. An RD/RA Consent Decree provides for the cleanup of the entire site and is often referred to as a “global settlement.” In the letter the EPA explained this schedule, noting that it expected the pre-remedial design work under the AOC 3 to be completed by the beginning of 2018, and also that it understood that several PRPs are participating in a neutral allocation, which the EPA was hopeful would be completed by early 2018. The EPA encouraged the PRPs to complete the allocation on a schedule consistent with the EPA’s intended negotiation schedule, adding that it expects to initiate the RD/RA negotiations on schedule regardless of the status of the allocation. The pre-remedial design work under the AOC 3 is now not expected to conclude until the end of 2019, and in March 2017, the PRPs provided the EPA with notice that the allocation is not scheduled to conclude until mid-2019. In June 2017, attorneys for the EPA informed attorneys for several PRPs that it now expects to begin RD/RA negotiations in the late summer or early fall of 2018. The Company cannot provide assurance that the EPA’s schedule can be met or will be adjusted. NWCS is defending itself vigorously in this confidential allocation process. At this point, the Company is not able to determine the likelihood of the allocation process being completed as intended by the participating PRPs, its specific allocation, or the likelihood of the parties then negotiating a global settlement with the EPA. Thus, NWCS cannot reasonably determine the likelihood of any outcome in this matter, including its potential liability. Under CERCLA, certain Federal, State and Indian Tribe officials are designated as natural resource trustees and have responsibility for ensuring the restoration of injured natural resources. On February 11, 2016, NWCS received a letter (the “Letter”) from the United States Department of Commerce, National Oceanic and Atmospheric Administration (“NOAA”), describing certain investigatory activities conducted by the Elliott Bay Trustee Council (the “Council”). The Council consists of all of the natural resources trustees for the LDW Site as well as two nearby Superfund sites, the Harbor Island site and the Lockheed West site. The members of the Council include the United States, on behalf of the U.S. National Oceanic and Atmospheric Administration and the U.S. Department of the Interior, the Washington State Department of Ecology, and the Suquamish and Muckleshoot Indian Tribes (together, the “Trustees”). The Letter appears to allege that NWCS may be a potentially liable party that allegedly contributed to the release of hazardous substances that have injured natural resources at the LDW Site. Damages to natural resources are in addition to clean-up costs. The Letter, versions of which NWCS believes were sent to all or a group of the PRPs at the LDW Site, also notified its recipients of their opportunity to participate in the Trustees’ development of an Assessment Plan and the performance of a Natural Resources Damages Assessment (“NRDA”) in accordance with the Assessment Plan for both the LDW Site and the east and west waterways of the Harbor Island site. NWCS timely responded with correspondence to the NOAA Office of General Counsel, dated March 9, 2016, in which it declined the invitation at that time. NWCS does not know how other PRPs responded to the Letter, and has not received any further communication from NOAA or the Trustees. The Trustees have not responded to NWCS’ letter and NWCS is not aware of any further action by the Trustees with respect to the Assessment Plan and NRDA. At this point, the Company is not able to determine the likelihood or amount of an assessment of natural resource damages against NWCS in connection with this matter. Some work is being done with respect to natural resource damages (“NRD”) at the LDW Site. On September 22, 2016, a proposed consent decree settlement was announced between the City of Seattle (the “City”) and NOAA and the other natural resource trustees for the LDW Site. The proposed NRD settlement that the City has entered into at the LDW Site, if approved, will generally provide that the City will fund the development of restoration projects by purchasing restoration credits from Bluefield Holdings, a company that develops such projects. At this time, NWCS has not been approached by either the Council or the trustees for the LDW Site regarding participation in any similar NRD settlements . In December 2016, the Lower Duwamish Fishers Study Data Report was released, which was the first step towards developing institutional controls specific to resident fish and shellfish consumption in the area. Chiquita Canyon Landfill Conditional Use Permit Decision and Appeal On October 12, 2004, the Company’s subsidiary, Chiquita Canyon, LLC (“CCL”), filed an application with the County of Los Angeles (the “County”) Department of Regional Planning (the “Department”) for a conditional use permit to authorize the continued operation and expansion of the Chiquita Canyon Landfill. The site has been in use as a landfill since 1972, and as a regional landfill, accepted approximately three million tons of waste in 2016. The application requests expansion of the existing waste footprint from 257 acres to 400 acres on CCL’s contiguous property, increased maximum elevation from 1,430 feet to 1,573 feet, new entrance and support facilities, a facility for the County or other third-party operator to operate household hazardous waste collection events, mixed organics/composting, a land set-aside for a potential future conversion technology facility, and additional project elements. Over the ensuing 12 and-a-half years, the County conducted a lengthy permitting and environmental impact review of the application. A draft environmental impact report was released in 2014, and several chapters of that report were revised and recirculated in 2016. As required by the County, this permitting and impact review was funded by the Company at substantial expense. In advance of a public hearing held on April 19, 2017 before the County’s Regional Planning Commission (the “Commission”), the Department published recommended conditions of approval for the conditional use permit. Those conditions recommended approval by the Commission of a smaller project, which would be a reduction from the current landfill operations. In addition, the Department recommended a dramatic increase in per-ton taxes and other fees, as well as currently unquantifiable future costs that the landfill would be forced to expend at the County’s direction and discretion. CCL submitted written objections to the proposed taxes and fees and operational restrictions in the proposed permit conditions, and similarly objected at the hearing. The recommended conditions of approval raised taxes and fees the landfill must pay to the County by up to 587% compared to fees under the landfill’s existing permit. At the public hearing on April 19, 2017, CCL requested that the recommended fees be reduced, so that the increase over current fees paid to the County would be in the range of 50% to 100% . The recommended conditions of approval reduced the proposed annual limit on overall tonnage the landfill can accept from approximately three million tons to approximately two million tons. At the public hearing on April 19, 2017, CCL requested that the recommended annual limit on overall tonnage be increased to the levels at which the landfill operated in 2016, or to approximately three million tons. Lastly, CCL requested that recommended new restrictions on operating hours be eliminated, so trucks could continue accessing the landfill at off-peak traffic hours, as is the current practice. Despite these requests, at the public hearing on April 19, 2017 , the Commission approved CCL’s application for an expansion of the Chiquita Canyon Landfill and a 30 -year extension of its conditional use permit, but without any modifications to the Department’s recommended taxes and fees or annual tonnage limits, and with only minor revisions to the Department’s recommended operating hours. CCL appealed the Commission’s decision to the County Board of Supervisors. Four separate appeals were also filed by opponents of the landfill expansion project. The Board of Supervisors conducted a public hearing on all of the appeals on June 27, 2017. At the conclusion of the public hearing, the Board of Supervisors took the following actions: (a) closed the public hearing; (b) certified the Final Environmental Impact Report, California Environmental Quality Act Findings of Fact and Statement of Overriding Considerations, and Mitigation Monitoring and Reporting Program; (c) indicated its intent to deny the appeals and approve the conditional use permit and oak tree permit based on the Commission’s approval and additional direction from the Board of Supervisors to revise the conditions of approval with respect to thirteen issue areas; and (d) directed County Counsel to prepare the necessary documents for final approval of the conditional use permit and oak tree permit. The County Counsel prepared the revised permit conditions and related documents as requested, and the Board of Supervisors approved the conditional use permit, as revised, on July 25, 2017. The revised conditions approved by the Board of Supervisors do provide some relief on taxes and fees and the limits on material that may be received at the Chiquita Canyon Landfill on a daily, monthly, and annual basis. However, the conditional use permit, as revised, also imposes new requirements beyond those that were required by the Commission, and still includes numerous operational restrictions and taxes and fees that will likely make the continued operation of the Chiquita Canyon Landfill less profitable for the Company. CCL is currently considering all of its options concerning the conditional use permit and may file one or more legal challenges against the County if it believes that any of the final permit conditions approved by the County Board of Supervisors violate state or federal law. Due to the fluid nature of the permitting process up to this point, the Company cannot reasonably determine the likelihood of any outcome in these matters . 

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	18. SUBSEQUENT EVENTS On July 24, 2017, the Board of Directors of the Company approved, subject to receipt of regulatory approvals, the annual renewal of the Company’s normal course issuer bid (the “NCIB”). The renewal will follow on the conclusion of the Company’s current NCIB expiring August 7, 2017. Upon approval, the Company anticipates that it will be authorized to make purchases during the period of August 8, 2017 to August 7, 2018 or until such earlier time as the NCIB is completed or terminated at the option of the Company. On July 25, 2017 , the Company announced that its Board of Directors approved a regular quarterly cash dividend of $0.12 per Company common share. The dividend will be paid on August 22, 2017 , to shareholders of record on the close of business on August 8, 2017 .   

Landfill Accounting (Tables)

Landfill Accounting (Tables)	6 Months Ended
	Jun. 30, 2017
Landfill Accounting [Abstract]
Reconciliation of Final Capping, Closure and Post-Closure Liability Balance	The following is a reconciliation of the Company’s final capping, closure and post-closure liability balance from December 31, 2016 to June 30, 2017:   Final capping, closure and post-closure liability at December 31, 2016 $ 244,909  Adjustments to final capping, closure and post-closure liabilities (30,703)  Liabilities incurred 7,280  Accretion expense associated with landfill obligations 5,775  Closure payments (2,545)  Foreign currency translation adjustment 925  Final capping, closure and post-closure liability at June 30, 2017 $ 225,641  

Acquisitions (Tables)

Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2017
Pro Forma Results of Operations	The following pro forma results of operations assume that the Company’s acquisition of Progressive Waste and its other acquisitions that were collectively insignificant, occurring during the six months ended June 30, 2016, were acquired as of January 1, 2016 (unaudited):   Six Months Ended June 30,  2016  Total revenue $ 2,051,327  Net income 178,058  Basic income per share 0.68  Diluted income per share 0.67 
Progressive Waste Solutions Ltd. [Member]
Summary of Consideration Transferred to Acquire Businesses and Amounts of Identifiable Assets Acquired, Liabilities Assumed and Noncontrolling Interests	The following table summarizes the consideration transferred to acquire Progressive Waste and the amounts of identifiable assets acquired and liabilities assumed:  Fair value of consideration transferred:  Shares issued $ 3,503,162  Debt assumed 1,729,274  5,232,436  Less: cash acquired (65,768)  Net fair value of consideration transferred 5,166,668  Recognized amounts of identifiable assets acquired and liabilities assumed associated with the business acquired:  Accounts receivable 231,709  Prepaid expenses and other current assets 28,623  Restricted assets 16,551  Property and equipment 2,063,011  Contracts 223,885  Customer lists 191,679  Other intangibles 218,499  Other assets 4,491  Accounts payable and accrued liabilities (264,992)  Deferred revenue (35,635)  Contingent consideration (19,412)  Other long-term liabilities (185,774)  Deferred income taxes (329,552)  Total identifiable net assets 2,143,083  Goodwill $ 3,023,585 
Other Acquisition [Member]
Summary of Consideration Transferred to Acquire Businesses and Amounts of Identifiable Assets Acquired, Liabilities Assumed and Noncontrolling Interests	The following table summarizes the consideration transferred and the preliminary amounts of identifiable assets acquired and liabilities assumed at the acquisition dates for the acquisitions consummated in the six months ended June 30, 2017 and 2016:   2017 Acquisitions 2016 Acquisitions Fair value of consideration transferred:  Cash $ 347,936 $ 12,541  Debt assumed 56,957 -  Notes issued to sellers 13,460 -  Fair value of operations exchanged 4,500 -  422,853 12,541  Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:  Accounts receivable 13,264 486  Prepaid expenses and other current assets 2,586 476  Property and equipment 128,298 2,782  Long-term franchise agreements and contracts 31,700 -  Customer lists 17,032 5,001  Other intangibles 27,261 -  Other assets 487 261  Accounts payable and accrued liabilities (11,119) (741)  Deferred revenue (3,176) (610)  Contingent consideration (15) (345)  Other long-term liabilities (1,080) -  Deferred income taxes (50,283) -  Total identifiable net assets 154,955 7,310  Goodwill $ 267,898 $ 5,231  

Assets Held for Sale (Tables)

Assets Held for Sale (Tables)	6 Months Ended
	Jun. 30, 2017
Assets Held for Sale [Abstract]
Assets and Liabilities Held for Sale	Our assets and liabilities held for sale as of June 30, 2017 and December 31, 2016, were comprised of the following:   June 30, 2017 December 31, 2016 Current assets held for sale:  Cash and equivalents $ 347 $ 42  Accounts receivable 7,405 5,726  Other current assets 979 571  $ 8,731 $ 6,339 Long-term assets held for sale:  Property and equipment $ 62,211 $ 33,624  Goodwill 17,215 244  Other assets 22 121  $ 79,448 $ 33,989 Current liabilities held for sale:  Accounts payable $ 2,789 $ 1,320  Accrued liabilities 885 1,811  Deferred revenue 2,691 252  $ 6,365 $ 3,383 Long-term liabilities held for sale:  Other liabilities $ 463 $ - 

Goodwill and Intangible Asset29

Goodwill and Intangible Assets, Net (Tables)	6 Months Ended
	Jun. 30, 2017
Goodwill and Intangible Assets, Net [Abstract]
Intangible Assets Exclusive of Goodwill	Intangible assets, exclusive of goodwill, consisted of the following at June 30, 2017:   Gross Carrying Amount Accumulated Amortization Accumulated Impairment Loss Net Carrying Amount Finite-lived intangible assets: Long-term franchise agreements and contracts $ 452,025 $ (103,551) $ - $ 348,474 Customer lists 387,209 (155,341) - 231,868 Permits and other 315,772 (28,719) - 287,053  1,155,006 (287,611) - 867,395 Indefinite-lived intangible assets: Solid waste collection and transportation permits 152,761 - - 152,761 Material recycling facility permits 42,283 - - 42,283 E&P facility permits 59,855 - (38,507) 21,348  254,899 - (38,507) 216,392 Intangible assets, exclusive of goodwill $ 1,409,905 $ (287,611) $ (38,507) $ 1,083,787   Intangible assets, exclusive of goodwill, consisted of the following at December 31, 2016:   Gross Carrying Amount Accumulated Amortization Accumulated Impairment Loss Net Carrying Amount Finite-lived intangible assets: Long-term franchise agreements and contracts $ 428,783 $ (86,552) $ - $ 342,231 Customer lists 371,203 (131,525) - 239,678 Permits and other 290,823 (21,966) - 268,857  1,090,809 (240,043) - 850,766 Indefinite-lived intangible assets: Solid waste collection and transportation permits 152,761 - - 152,761 Material recycling facility permits 42,283 - - 42,283 E&P facility permits 59,855 - (38,507) 21,348  254,899 - (38,507) 216,392 Intangible assets, exclusive of goodwill $ 1,345,708 $ (240,043) $ (38,507) $ 1,067,158  
Estimated Future Amortization Expense of Amortizable Intangible Assets	Estimated future amortization expense for the next five years relating to finite-lived intangible assets is as follows:   For the year ending December 31, 2017 $ 100,344  For the year ending December 31, 2018 $ 93,108  For the year ending December 31, 2019 $ 83,147  For the year ending December 31, 2020 $ 75,471  For the year ending December 31, 2021 $ 66,754 

Long-Term Debt (Tables)

Long-Term Debt (Tables)	6 Months Ended
	Jun. 30, 2017
Long-Term Debt [Abstract]
Long-Term Debt	Long-term debt consists of the following:   June 30, 2017 December 31, 2016  Revolver under Credit Agreement, bearing interest ranging from 2.18 % to 2.95 % (a) $ 256,995 $ 310,582  Term loan under Credit Agreement, bearing interest at 2.43 % (a) 1,637,500 1,637,500  2018 Notes, bearing interest at 4.00% 50,000 50,000  2019 Notes, bearing interest at 5.25 % 175,000 175,000  2021 Notes, bearing interest at 4.64% 100,000 100,000  New 2021 Notes, bearing interest at 2.39% 150,000 150,000  2022 Notes, bearing interest at 3.09% 125,000 125,000  2023 Notes, bearing interest at 2.75% 200,000 200,000  2024 Notes, bearing interest at 3.24% 150,000 -  2025 Notes, bearing interest at 3.41% 375,000 375,000  2026 Notes, bearing interest at 3.03% 400,000 400,000  2027 Notes, bearing interest at 3.49% 250,000 -  Tax-exempt bonds, bearing interest ranging from 0.97 % to 1.00 % (a) 95,430 95,430  Notes payable to sellers and other third parties, bearing interest at 2.00 % to 24.81 % (a) 26,935 14,180  3,991,860 3,632,692  Less – current portion (11,511) (1,650)  Less – debt issuance costs (16,440) (14,282)  $ 3,963,909 $ 3,616,760 ____________________ (a) Interest rates represent the interest rates incurred at June 30, 2017 .
Details of the Company's Credit Agreement	Details of the Credit Agreement are as follows:    June 30, 2017 December 31, 2016 Revolver under Credit Agreement  Available $ 1,089,603 $ 1,004,451  Letters of credit outstanding $ 215,902 $ 247,467  Total amount drawn, as follows: $ 256,995 $ 310,582  Amount drawn – Canadian prime rate loan $ 11,559 $ 7,448  Interest rate applicable - Canadian prime rate loan 2.95% 2.95%  Amount drawn – Canadian BA loan $ 245,436 $ 303,134  Interest rate applicable – Canadian BA loan 2.18% 2.13%  Commitment – rate applicable 0.15% 0.15%  Term loan under Credit Agreement  Amount drawn – U.S. based LIBOR loan $ 1,637,500 $ 1,637,500  Interest rate applicable – U.S. based LIBOR loan 2.43% 1.97% 

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Summary of Financial Information Concerning Company's Reportable Segments	Summarized financial information concerning the Company’s reportable segments for the three and six months ended June 30, 2017 and 2016, is shown in the following tables:  Three Months Ended June 30, 2017 Revenue Intercompany Revenue (b) Reported Revenue Segment EBITDA (c)  Southern $ 323,108 $ (37,725) $ 285,383 $ 67,168  Western 288,953 (31,461) 257,492 87,045  Eastern 292,327 (46,017) 246,310 72,095  Canada 206,629 (26,332) 180,297 66,365  Central 182,781 (23,363) 159,418 60,716  E&P 48,677 (2,008) 46,669 21,092  Corporate (a) - - - (11,162)  $ 1,342,475 $ (166,906) $ 1,175,569 $ 363,319   Three Months Ended June 30, 2016 Revenue Intercompany Revenue (b) Reported Revenue Segment EBITDA (c)  Southern $ 137,169 $ (16,618) $ 120,551 $ 27,228  Western 265,911 (29,480) 236,431 79,835  Eastern 168,824 (26,240) 142,584 44,824  Canada 70,103 (9,518) 60,585 23,555  Central 157,997 (18,327) 139,670 52,578  E&P 31,002 (3,184) 27,818 6,485  Corporate (a) - - - (75,865)  $ 831,006 $ (103,367) $ 727,639 $ 158,640   Six Months Ended June 30, 2017 Revenue Intercompany Revenue (b) Reported Revenue Segment EBITDA (c)  Southern $ 640,447 $ (74,942) $ 565,505 $ 136,108  Western 552,954 (59,872) 493,082 162,613  Eastern 565,624 (87,827) 477,797 137,546  Canada 391,960 (48,627) 343,333 123,665  Central 346,593 (42,866) 303,727 113,368  E&P 87,743 (4,352) 83,391 35,637  Corporate (a) - - - (26,783)  $ 2,585,321 $ (318,486) $ 2,266,835 $ 682,154   Six Months Ended June 30, 2016 Revenue Intercompany Revenue (b) Reported Revenue Segment EBITDA (c)  Southern $ 180,135 $ (22,665) $ 157,470 $ 36,717  Western 512,775 (57,111) 455,664 153,625  Eastern 297,040 (46,660) 250,380 79,438  Canada 70,103 (9,518) 60,585 23,555  Central 291,895 (32,288) 259,607 96,431  E&P 64,098 (5,485) 58,613 13,034  Corporate (a) - - - (84,353)  $ 1,416,046 $ (173,727) $ 1,242,319 $ 318,447 ____________________ (a) 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. (b) 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. (c) 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.
Total Assets for Reportable Segments	Total assets for each of the Company’s reportable segments at June 30, 2017 and December 31, 2016, were as follows:    June 30, 2017 December 31, 2016  Southern $ 2,801,661 $ 2,869,841  Western 1,518,397 1,516,870  Eastern 1,944,737 1,541,854  Canada 2,583,098 2,532,046  Central 1,304,610 1,302,900  E&P 986,957 1,068,086  Corporate 515,903 272,328  Total Assets $ 11,655,363 $ 11,103,925 
Changes in Goodwill by Reportable Segment	The following tables show changes in goodwill during the six months ended June 30, 2017 and 2016, by reportable segment:      Southern Western Eastern Canada Central E&P Total  Balance as of December 31, 2016 $ 1,470,023 $ 376,537 $ 533,160 $ 1,465,274 $ 467,924 $ 77,343 $ 4,390,261  Goodwill acquired 10,335 - 249,724 7,128 711 - 267,898  Impairment loss - - - - - (77,343) (77,343)  Goodwill adjustment for assets sold 2,205 - 321 - - - 2,526  Impairment loss related to assets held for sale (27,311) - - - - - (27,311)  Goodwill reclassified as assets held for sale (17,215) - - - - - (17,215)  Impact of changes in foreign currency - - - 50,757 - - 50,757  Balance as of June 30, 2017 $ 1,438,037 $ 376,537 $ 783,205 $ 1,523,159 $ 468,635 $ - $ 4,589,573     Southern Western Eastern Canada Central E&P Total  Balance as of December 31, 2015 $ 95,710 $ 373,820 $ 459,532 $ - $ 416,420 $ 77,343 $ 1,422,825  Goodwill acquired 1,241,419 2,673 70,723 1,510,220 42,113 - 2,867,148  Impact of changes in foreign currency - - - 9,490 - - 9,490  Balance as of June 30, 2016 $ 1,337,129 $ 376,493 $ 530,255 $ 1,519,710 $ 458,533 $ 77,343 $ 4,299,463  
Reconciliation of Primary Measure of Segment Profitability to Income Before Income Tax Provision	A reconciliation of the Company’s primary measure of segment profitability (segment EBITDA) to Income before income tax provision in the Condensed Consolidated Statements of Net Income is as follows:   Three months ended June 30, Six months ended June 30,  2017 2016 2017 2016  Southern segment EBITDA $ 67,168 $ 27,228 $ 136,108 $ 36,717  Western segment EBITDA 87,045 79,835 162,613 153,625  Eastern segment EBITDA 72,095 44,824 137,546 79,438  Canada segment EBITDA 66,365 23,555 123,665 23,555  Central segment EBITDA 60,716 52,578 113,368 96,431  E&P segment EBITDA 21,092 6,485 35,637 13,034  Subtotal reportable segments 374,481 234,505 708,937 402,800  Unallocated corporate overhead (11,162) (75,865) (26,783) (84,353)  Depreciation (132,827) (84,348) (258,067) (145,245)  Amortization of intangibles (24,762) (14,081) (50,272) (21,775)  Impairments and other operating items 1,180 3,284 (140,501) 3,048  Interest expense (31,160) (20,485) (60,291) (37,670)  Other income (expense), net 1,860 (714) 3,326 (492)  Foreign currency transaction gain (loss) (1,048) 689 (1,638) 689  Income before income tax provision $ 176,562 $ 42,985 $ 174,711 $ 117,002  
Total Reported Revenues by Service Line	The following tables reflect a breakdown of the Company’s revenue and inter-company eliminations for the periods indicated:   Three months ended June 30, 2017  Revenue Intercompany Revenue Reported Revenue % of Reported Revenue  Solid waste collection $ 797,131 $ (2,392) $ 794,739 67.6%  Solid waste disposal and transfer 416,176 (158,937) 257,239 21.9  Solid waste recycling 43,693 (2,351) 41,342 3.5  E&P waste treatment, recovery and disposal 50,043 (2,870) 47,173 4.0  Intermodal and other 35,432 (356) 35,076 3.0  Total $ 1,342,475 $ (166,906) $ 1,175,569 100.0%    Three months ended June 30, 2016  Revenue Intercompany Revenue Reported Revenue % of Reported Revenue  Solid waste collection $ 502,948 $ (1,778) $ 501,170 68.9%  Solid waste disposal and transfer 256,847 (96,815) 160,032 22.0  Solid waste recycling 18,119 (1,393) 16,726 2.3  E&P waste treatment, recovery and disposal 30,734 (3,253) 27,481 3.8  Intermodal and other 22,358 (128) 22,230 3.0  Total $ 831,006 $ (103,367) $ 727,639 100.0%    Six months ended June 30, 2017  Revenue Intercompany Revenue Reported Revenue % of Reported Revenue  Solid waste collection $ 1,565,478 $ (4,592) $ 1,560,886 68.9%  Solid waste disposal and transfer 773,201 (302,378) 470,823 20.8  Solid waste recycling 87,581 (4,935) 82,646 3.6  E&P waste treatment, recovery and disposal 89,864 (5,838) 84,026 3.7  Intermodal and other 69,197 (743) 68,454 3.0  Total $ 2,585,321 $ (318,486) $ 2,266,835 100.0%    Six months ended June 30, 2016  Revenue Intercompany Revenue Reported Revenue % of Reported Revenue  Solid waste collection $ 859,546 $ (3,099) $ 856,447 68.9%  Solid waste disposal and transfer 426,929 (162,849) 264,080 21.3  Solid waste recycling 28,738 (2,031) 26,707 2.1  E&P waste treatment, recovery and disposal 63,586 (5,620) 57,966 4.7  Intermodal and other 37,247 (128) 37,119 3.0  Total $ 1,416,046 $ (173,727) $ 1,242,319 100.0% 

Derivative Financial Instrume32

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value of Derivative Instrument Designated as Cash Flow Hedges	 The fair values of derivative instruments designated as cash flow hedges as of June 30, 2017, were as follows:   Derivatives Designated as Cash Asset Derivatives Liability Derivatives Flow Hedges Balance Sheet Location Fair Value Balance Sheet Location Fair Value  Interest rate swaps Prepaid expenses and other current assets (a) $ 1,428 Accrued liabilities (a) $ (2,411)  Other assets, net 11,068 Other long-term liabilities (1,781)   Fuel hedges Prepaid expenses and other current assets (b) 103 Accrued liabilities (b) (2,606)  Other long-term liabilities (174)  Total derivatives designated as cash flow hedges $ 12,599 $ (6,972) ____________________ (a) Represents the estimated amount of the existing unrealized gains and losses, respectively, on interest rate swaps as of June 30, 2017 (based on the interest rate yield curve at that date), included in AOCIL expected to be reclassified into pre-tax earnings within the next 12 months. The actual amounts reclassified into earnings are dependent on future movements in interest rates. (b) Represents the estimated amount of the existing unrealized gains and losses, respectively, on fuel hedges as of June 30, 2017 (based on the forward DOE diesel fuel index curve at that date), included in AOCIL expected to be reclassified into pre-tax earnings within the next 12 months. The actual amounts reclassified into earnings are dependent on future movements in diesel fuel prices.  The fair values of derivative instruments designated as cash flow hedges as of December 31, 2016, were as follows:  Derivatives Designated as Cash Asset Derivatives Liability Derivatives Flow Hedges Balance Sheet Location Fair Value Balance Sheet Location Fair Value  Interest rate swaps Prepaid expenses and other current assets $ 127 Accrued liabilities $ (3,260)  Other assets, net 13,822 Other long-term liabilities (2,350)   Fuel hedges Prepaid expenses and other current assets 1,343 Accrued liabilities (3,258)  Other assets, net 1,651  Total derivatives designated as cash flow hedges $ 16,943 $ (8,868)  
Impact of Cash Flow Hedges on Results of Operations, Comprehensive Income and Accumulated Other Comprehensive Loss	The following table summarizes the impact of the Company’s cash flow hedges on the results of operations, comprehensive income (loss) and AOCIL for the three and six months ended June 30, 2017 and 2016:  Derivatives Designated as Cash Flow Hedges Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax (Effective Portion) (a) Statement of Net Income Classification Amount of (Gain) or Loss Reclassified from AOCIL into Earnings, Net of Tax (Effective Portion) (b),(c)  Three Months Ended June 30, Three Months Ended June 30,  2017 2016 2017 2016  Interest rate swaps $ (4,098) $ (2,352) Interest expense $ 558 $ 1,047  Fuel hedges (720) 1,017 Cost of operations 626 911  Total $ (4,818) $ (1,335) $ 1,184 $ 1,958   Derivatives Designated as Cash Flow Hedges Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax (Effective Portion) (a) Statement of Net Income Classification Amount of (Gain) or Loss Reclassified from AOCIL into Earnings, Net of Tax (Effective Portion) (b),(c)  Six Months Ended June 30, Six Months Ended June 30,  2017 2016 2017 2016  Interest rate swaps $ (1,379) $ (6,493) Interest expense $ 1,353 $ 2,105  Fuel hedges (2,714) 210 Cost of operations 1,222 2,025  Total $ (4,093) $ (6,283) $ 2,575 $ 4,130 ___________________ (a) In accordance with the derivatives and hedging guidance, the effective portions of the changes in fair values of interest rate swaps and fuel hedges have been recorded in equity as a component of AOCIL. As the critical terms of the interest rate swaps match the underlying debt being hedged, no ineffectiveness is recognized on these swaps and, therefore, all unrealized changes in fair value are recorded in AOCIL. Because changes in the actual price of diesel fuel and changes in the DOE index price do not offset exactly each reporting period, the Company assesses whether the fuel hedges are highly effective using the cumulative dollar offset approach. (b) Amounts reclassified from AOCIL into earnings related to realized gains and losses on interest rate swaps are recognized when interest payments or receipts occur related to the swap contracts, which correspond to when interest payments are made on the Company’s hedged debt. (c) Amounts reclassified from AOCIL into earnings related to realized gains and losses on the fuel hedges are recognized when settlement payments or receipts occur related to the hedge contracts, which correspond to when the underlying fuel is consumed.
Interest Rate Swap [Member]
Company's Derivative Instruments	At June 30, 2017, the Company’s derivative instruments included 11 interest rate swap agreements as follows:   Date Entered Notional Amount Fixed Interest Rate Paid* Variable Interest Rate Received Effective Date Expiration Date  April 2014 $ 100,000 1.800% 1-month LIBOR July 2014 July 2019  May 2014 $ 50,000 2.344% 1-month LIBOR October 2015 October 2020  May 2014 $ 25,000 2.326% 1-month LIBOR October 2015 October 2020  May 2014 $ 50,000 2.350% 1-month LIBOR October 2015 October 2020  May 2014 $ 50,000 2.350% 1-month LIBOR October 2015 October 2020  April 2016 $ 100,000 1.000% 1-month LIBOR February 2017 February 2020  June 2016 $ 75,000 0.850% 1-month LIBOR February 2017 February 2020  June 2016 $ 150,000 0.950% 1-month LIBOR January 2018 January 2021  June 2016 $ 150,000 0.950% 1-month LIBOR January 2018 January 2021  July 2016 $ 50,000 0.900% 1-month LIBOR January 2018 January 2021  July 2016 $ 50,000 0.890% 1-month LIBOR January 2018 January 2021 ____________________ * Plus applicable margin.
Fuel [Member] | Commodity Contract [Member]
Company's Derivative Instruments	At June 30, 2017, the Company’s derivative instruments included four fuel hedge agreements as follows:  Date Entered Notional Amount (in gallons per month) Diesel Rate Paid Fixed (per gallon) Diesel Rate Received Variable Effective Date Expiration Date  May 2015 300,000 $3.2800 DOE Diesel Fuel Index* January 2016 December 2017  May 2015 200,000 $3.2750 DOE Diesel Fuel Index* January 2016 December 2017  July 2016 500,000 $2.4988 DOE Diesel Fuel Index* January 2017 December 2017  July 2016 1,000,000 $2.6345 DOE Diesel Fuel Index* January 2018 December 2018 ____________________ * If the national U.S. on-highway average price for a gallon of diesel fuel (“average price”), as published by the U.S. Department of Energy (“DOE”), exceeds the contract price per gallon, the Company receives the difference between the average price and the contract price (multiplied by the notional number of gallons) from the counterparty. If the average price is less than the contract price per gallon, the Company pays the difference to the counterparty. 

Fair Value of Financial Instr33

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value [Abstract]
Carrying Values and Fair Values of Debt Instruments	The carrying values and fair values of the Company’s debt instruments where the carrying values do not approximate their fair values as of June 30, 2017 and December 31, 2016, are as follows:   Carrying Value at Fair Value* at  June 30, 2017 December 31, 2016 June 30, 2017 December 31, 2016  4.00% Senior Notes due 2018 $ 50,000 $ 50,000 $ 50,734 $ 51,226  5.25% Senior Notes due 2019 $ 175,000 $ 175,000 $ 186,411 $ 187,671  4.64% Senior Notes due 2021 $ 100,000 $ 100,000 $ 106,979 $ 106,618  2.39% Senior Notes due 2021 $ 150,000 $ 150,000 $ 148,267 $ 146,168  3.09% Senior Notes due 2022 $ 125,000 $ 125,000 $ 126,099 $ 123,974  2.75% Senior Notes due 2023 $ 200,000 $ 200,000 $ 196,690 $ 192,238  3.24% Senior Notes due 2024 $ 150,000 $ - $ 150,597 $ -  3.41% Senior Notes due 2025 $ 375,000 $ 375,000 $ 378,842 $ 368,968  3.03% Senior Notes due 2026 $ 400,000 $ 400,000 $ 391,387 $ 379,438  3.49% Senior Notes due 2027 $ 250,000 $ - $ 251,601 $ - ______________________ * Senior Notes are classified as Level 2 within the fair value hierarchy. Fair value is based on quotes of bonds with similar ratings in similar industries.

Net Income Per Share Informat34

Net Income Per Share Information (Tables)	6 Months Ended
	Jun. 30, 2017
Net Income Per Share Information [Abstract]
Basic and Diluted Net Income Per Common Share	The following table sets forth the calculation of the numerator and denominator used in the computation of basic and diluted net income per common share attributable to the Company’s shareholders for the three and six months ended June 30, 2017 and 2016:   Three months ended June 30, Six months ended June 30,  2017 2016 2017 2016 Numerator:  Net income attributable to Waste Connections for basic and diluted earnings per share $ 123,656 $ 27,489 $ 138,530 $ 72,331  Denominator:  Basic shares outstanding 263,387,338 210,305,335 263,225,541 197,244,873  Dilutive effect of equity-based awards 722,256 575,397 781,766 791,919  Diluted shares outstanding 264,109,594 210,880,732 264,007,307 198,036,792  

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value [Abstract]
Assets and Liabilities Measured At Fair Value on Recurring Basis	The Company’s assets and liabilities measured at fair value on a recurring basis at June 30, 2017 and December 31, 2016, were as follows:   Fair Value Measurement at June 30, 2017 Using  Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3)  Interest rate swap derivative instruments – net asset position $ 8,304 $ - $ 8,304 $ -  Fuel hedge derivative instruments – net liability position $ (2,677) $ - $ - $ (2,677)  Restricted assets $ 58,985 $ - $ 58,985 $ -  Contingent consideration $ (58,315) $ - $ - $ (58,315)    Fair Value Measurement at December 31, 2016 Using  Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3)  Interest rate swap derivative instruments – net asset position $ 8,339 $ - $ 8,339 $ -  Fuel hedge derivative instrument – net liability position $ (264) $ - $ - $ (264)  Restricted assets $ 57,166 $ - $ 57,166 $ -  Contingent consideration $ (51,826) $ - $ - $ (51,826) 
Change in Fair Value for Level 3 Derivatives	The following table summarizes the changes in the fair value for Level 3 derivatives for the six months ended June 30, 2017 and 2016:    Six Months Ended June 30,  2017 2016  Beginning balance $ (264) $ (9,900)  Realized losses included in earnings 1,976 3,274  Unrealized (gains) losses included in AOCIL (4,389) 324  Ending balance $ (2,677) $ (6,302)  
Fair Value for Level 3 Liabilities	The following table summarizes the changes in the fair value for Level 3 liabilities related to contingent consideration for the six months ended June 30, 2017 and 2016:   Six Months Ended June 30,  2017 2016  Beginning balance $ 51,826 $ 49,394  Contingent consideration recorded at acquisition date 15 13,110  Payment of contingent consideration recorded at acquisition date (5,565) (4,109)  Payment of contingent consideration recorded in earnings - (132)  Adjustments to contingent consideration 11,013 (2,495)  Interest accretion expense 1,026 756  Ending balance $ 58,315 $ 56,524  

Other Comprehensive Income (L36

Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2017
Other Comprehensive Income (Loss) [Abstract]
Components of Other Comprehensive Income (Loss)	The components of other comprehensive income (loss) and related tax effects for the three and six month periods ended June 30, 2017 and 2016 are as follows:   Three months ended June 30, 2017  Gross Tax effect Net of tax  Interest rate swap amounts reclassified into interest expense $ 760 $ (202) $ 558  Fuel hedge amounts reclassified into cost of operations 1,012 (386) 626  Changes in fair value of interest rate swaps (2,904) (1,194) (4,098)  Changes in fair value of fuel hedges (1,164) 444 (720)  Foreign currency translation adjustment 53,193 - 53,193  $ 50,897 $ (1,338) $ 49,559     Three months ended June 30, 2016  Gross Tax effect Net of tax  Interest rate swap amounts reclassified into interest expense $ 1,693 $ (646) $ 1,047  Fuel hedge amounts reclassified into cost of operations 1,473 (562) 911  Changes in fair value of interest rate swaps (3,826) 1,474 (2,352)  Changes in fair value of fuel hedges 1,629 (612) 1,017  Foreign currency translation adjustment 12,651 - 12,651  $ 13,620 $ (346) $ 13,274     Six months ended June 30, 2017  Gross Tax effect Net of tax  Interest rate swap amounts reclassified into interest expense $ 1,841 $ (488) $ 1,353  Fuel hedge amounts reclassified into cost of operations 1,976 (754) 1,222  Changes in fair value of interest rate swaps (1,876) 497 (1,379)  Changes in fair value of fuel hedges (4,389) 1,675 (2,714)  Foreign currency translation adjustment 70,627 - 70,627  $ 68,179 $ 930 $ 69,109     Six months ended June 30, 2016  Gross Tax effect Net of tax  Interest rate swap amounts reclassified into interest expense $ 3,403 $ (1,298) $ 2,105  Fuel hedge amounts reclassified into cost of operations 3,274 (1,249) 2,025  Changes in fair value of interest rate swaps (10,514) 4,021 (6,493)  Changes in fair value of fuel hedges 324 (114) 210  Foreign currency translation adjustment 12,651 - 12,651  $ 9,138 $ 1,360 $ 10,498  
Amounts Included in Accumulated Other Comprehensive Loss	A rollforward of the amounts included in AOCIL, net of taxes, for the six months ended June 30, 2017 and 2016, is as follows:   Fuel Hedges Interest Rate Swaps Foreign Currency Translation Adjustment Accumulated Other Comprehensive Income ( Loss )  Balance at December 31, 2016 $ (164) $ 8,094 $ (50,931) $ (43,001)  Amounts reclassified into earnings 1,222 1,353 - 2,575  Changes in fair value (2,714) (1,379) - (4,093)  Foreign currency translation adjustment - - 70,627 70,627  Balance at June 30, 2017 $ (1,656) $ 8,068 $ 19,696 $ 26,108  .   Fuel Hedges Interest Rate Swaps Foreign Currency Translation Adjustment Accumulated Other Comprehensive Income ( Loss )  Balance at December 31, 2015 $ (6,134) $ (6,037) $ - $ (12,171)  Amounts reclassified into earnings 2,025 2,105 - 4,130  Changes in fair value 210 (6,493) - (6,283)  Foreign currency translation adjustment - - 12,651 12,651  Balance at June 30, 2016 $ (3,899) $ (10,425) $ 12,651 $ (1,673) 

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2017
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Activity Related to Restricted Stock Units	A summary of activity related to restricted share units (“RSUs”) during the six-month period ended June 30, 2017, is presented below:   Unvested Shares  Outstanding at December 31, 2016 1,252,291  Granted 413,179  Forfeited (26,483)  Vested and issued (534,881)  Vested and deferred (34,033)  Outstanding at June 30, 2017 1,070,073  
Performance Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Performance-Based Restricted Stock Units Activity and Related Information	A summary of activity related to performance-based restricted share units (“PSUs”) during the six-month period ended June 30, 2017, is presented below:   Unvested Shares  Outstanding at December 31, 2016 427,144  Granted 210,103  Vested and issued (122,786)  Outstanding at June 30, 2017 514,461  
Progressive Waste Solutions Ltd. [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Stock Option Activity and Related Information	A summary of activity related to Progressive Waste share based options during the six-month period ended June 30, 2017, is presented below:   Outstanding at December 31, 2016 672,996  Share settled (33,792)  Cash settled (322,785)  Forfeited (9,662)  Outstanding at June 30, 2017 306,757 
Summary of Vesting Activity Related to Share Based Options	A summary of vesting activity related to Progressive Waste share based options during the six-month period ended June 30, 2017, is presented below:   Vested at December 31, 2016 601,395  Vested over remaining service period 71,601  Share settled (33,792)  Cash settled (322,785)  Forfeited (9,662)  Vested at June 30, 2017 306,757 
Progressive Waste Solutions Ltd. [Member] | Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Activity Related to Restricted Stock Units	A summary of activity related to Progressive Waste RSUs during the six-month period ended June 30, 2017, is presented below:   Outstanding at December 31, 2016 269,233  Cash settled (65,211)  Outstanding at June 30, 2017 204,022 
Summary of Vesting Activity Related to RSUs	A summary of vesting activity related to Progressive Waste RSUs during the six-month period ended June 30, 2017, is presented below:   Vested at December 31, 2016 222,517  Vested over remaining service period 13,373  Cash settled (65,211)  Vested at June 30, 2017 170,679 
Progressive Waste Solutions Ltd. [Member] | Performance Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Performance-Based Restricted Stock Units Activity and Related Information	A summary of activity related to Progressive Waste PSUs during the six-month period ended June 30, 2017, is presented below:   Outstanding at December 31, 2016 92,957  Cash settled, net of notional dividend (37,164)  Outstanding at June 30, 2017 55,793 
Summary of Vesting Activity Related to PSUs	A summary of vesting activity related to Progressive Waste PSUs during the six-month period ended June 30, 2017, is presented below:   Vested at December 31, 2016 35,727  Vested over remaining service period 8,042  Cash settled, net of notional dividend (37,164)  Vested at June 30, 2017 6,605 
Deferred Compensation, Share-based Payments [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Activity Related to Restricted Stock Units	A summary of activity related to deferred share units (“DSUs”) during the six-month period ended June 30, 2017, is presented below:   Vested Shares  Outstanding at December 31, 2016 68,942  Granted 4,725  Share settled (35,416)  Cash settled (25,113)  Outstanding at June 30, 2017 13,138  

New Accounting Standards (Narra

New Accounting Standards (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Jan. 01, 2017	Jun. 30, 2016	Dec. 31, 2015
Sales incentives		$ 16,000
Deferred tax asset, current	$ 82,440	82,440	$ 89,177
Goodwill impairment charge	77,343
Goodwill	4,589,573	4,589,573	4,390,261		$ 4,299,463	$ 1,422,825
Accounting Standards Update 2016 09 [Member]
Excess tax benefits associated with equity-based compensation	6,792
Cumulative effect adjustment to Retained Earnings	1,384	$ 1,384
Exploration and Production [Member]
Goodwill impairment charge	77,343		0
Goodwill			$ 77,343	$ 77,343	$ 77,343	$ 77,343
Exploration and Production [Member] | Accounting Standards Update 2017 04 [Member]
Goodwill impairment charge	$ 77,343

Landfill Accounting (Narrative)

Landfill Accounting (Narrative) (Details) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2017USD ($)site$ / T	Jun. 30, 2016USD ($)$ / T	Dec. 31, 2016USD ($)
Landfill Accounting [Line Items]
Number of municipal solid waste landfills owned or operated by company	68
Number of owned landfills that only accept exploration and production waste	11
Number of owned landfills that only accept construction and demolition, industrial and other non-putrescible waste	14
Number of landfills owned and operated by company	79
Number of landfills operated, not owned, under life-of-site operating agreements	8
Number of landfills operated under limited-term operating agreements	6
Property and equipment, net | $	$ 4,729,335		$ 4,738,055
Average remaining landfill life based on permitted capacity and projected annual disposal volumes	25 years
Number of owned landfills the company is seeking to expand	16
Number of landfills operated under life-of-site operating agreements that the company is seeking to expand	2
Average remaining landfill life based on permitted capacity, projected annual disposal volumes and probable expansion capacity	31 years
Life of Company's owned landfills and landfills operated under life-of-site operating agreements min range	1 year
Life of Company's owned landfills and landfills operated under life of site operating agreements max range	196 years
Landfill depletion expense | $	$ 93,968	$ 49,685
Average rate per ton consumed related to landfill depletion at owned landfills and landfills operated under life-of-site agreements | $ / T	4.51	3.92
Discount rate for purposes of computing layers for final capping, closure and post-closure obligations	4.75%		4.75%
Inflation rate for purposes of computing layers for final capping, closure and post-closure obligations	2.50%		2.50%
Accretion expense associated with landfill obligations | $	$ 5,775	$ 2,763
Average rate per ton consumed related to final capping, closure and post-closure landfill accretion expense | $ / T	0.27	0.22
Restricted asset balance for purposes of securing our performance of future final capping, closure and post-closure obligations | $	$ 57,135		$ 55,388
Landfill [Member]
Landfill Accounting [Line Items]
Property and equipment, net | $	$ 2,689,906

Landfill Accounting (Reconcilia

Landfill Accounting (Reconciliation of Final Capping, Closure and Post-Closure Liability Balance) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Landfill Accounting [Abstract]
Final capping, closure and post-closure liability at the beginning of the period	$ 244,909
Adjustments to final capping, closure and post-closure liabilities	(30,703)
Liabilities incurred	7,280
Accretion expense associated with landfill obligations	5,775	$ 2,763
Closure payments	(2,545)
Foreign currency translation adjustment	925
Final capping, closure and post-closure liability at the end of the period	$ 225,641

Acquisitions (Narrative) (Detai

Acquisitions (Narrative) (Detail) $ / shares in Units, $ in Thousands	Jun. 02, 2016shares	Jan. 31, 2017territorycustomer	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)entity	Jun. 30, 2016USD ($)entity	Jun. 30, 2017USD ($)	Dec. 31, 2016USD ($)	Jun. 01, 2016USD ($)$ / shares
Business Acquisition [Line Items]
Cash consideration, net of cash acquired						$ 347,936	$ 12,541
Stockholders equity stock conversion ratio				1.5
Acquisition-related costs						$ 1,701
Number of individual businesses acquired that are not specifically described | entity						6
Impairments and other operating items				$ (1,180)	$ (3,284)	$ 140,501	(3,048)
Change in liability-classified contingent consideration						11,013	(2,495)
Revenues				1,175,569	727,639	2,266,835	1,242,319
Income before income tax provision				176,562	42,985	174,711	117,002
Goodwill expected to be deductible for tax purposes				11,111		11,111		$ 11,111
Goodwill acquired						267,898	2,867,148
Trade receivables acquired in business combination gross contractual amount				13,964		13,964		13,964
Trade receivables acquired in business combination expected to be uncollectible amount				$ 700		$ 700		$ 700
Fair value of acquired working capital is provisional | entity						5
Groot Industries, Inc. [Member]
Business Acquisition [Line Items]
Revenues									$ 200,000
Progressive Waste Solutions Ltd. [Member]
Business Acquisition [Line Items]
Contingent consideration payable period								1 year
Issuance of common shares to acquire Progressive Waste, shares | shares	78,218,878
Closing price per share | $ / shares										$ 44.79
Fair value discount rate			2.00%
Stockholders equity stock conversion ratio	3.1152645
Acquisition-related costs						$ 758	31,559
Contingent payable fair value										$ 7,315
Impairments and other operating items						50,377
Change in liability-classified contingent consideration						11,313
Revenues						1,001,653
Income before income tax provision						116,887
Goodwill expected to be deductible for tax purposes			$ 303,594		303,594		303,594
Goodwill acquired			3,023,585
Trade receivables acquired in business combination gross contractual amount			239,212		239,212		239,212
Trade receivables acquired in business combination expected to be uncollectible amount			7,503		$ 7,503		$ 7,503
Progressive Waste Solutions Ltd. [Member] | Credit Agreement [Member]
Business Acquisition [Line Items]
Liabilities incurred			$ 1,659,465
Progressive Waste Solutions Ltd. [Member] | Maximum [Member]
Business Acquisition [Line Items]
Contingent payable fair value										$ 5,000
Progressive Waste Solutions Ltd. [Member] | Waste Connections, Inc. [Member]
Business Acquisition [Line Items]
Stockholders equity stock conversion ratio	3.1152645
Percentage of combined company owned			70.00%		70.00%		70.00%
Progressive Waste Solutions Ltd. [Member] | Progressive Waste [Member]
Business Acquisition [Line Items]
Percentage of combined company owned			30.00%		30.00%		30.00%
Groot Industries, Inc. [Member]
Business Acquisition [Line Items]
Number of customers served by company acquired | customer		300,000
Number of collection operations acquired | territory		7
Number of transfer stations acquired | territory		6
Number of recycling facilities acquired | territory		1
Other Acquisition [Member]
Business Acquisition [Line Items]
Acquisition-related costs							$ 636
Number of immaterial businesses acquired in period | entity							8
Goodwill expected to be deductible for tax purposes			$ 5,231		$ 5,231		$ 5,231
Goodwill acquired							5,231
Trade receivables acquired in business combination gross contractual amount			876		876		876
Trade receivables acquired in business combination expected to be uncollectible amount			390		$ 390		$ 390
Tax-exempt Bonds [Member] | Progressive Waste Solutions Ltd. [Member]
Business Acquisition [Line Items]
Liabilities incurred			64,000
Other Long-term Liabilities [Member} | Progressive Waste Solutions Ltd. [Member]
Business Acquisition [Line Items]
Liabilities incurred			5,809
Debt [Member]
Business Acquisition [Line Items]
Liabilities incurred						$ 56,957
Debt [Member] | Progressive Waste Solutions Ltd. [Member]
Business Acquisition [Line Items]
Liabilities incurred			$ 1,729,274

Acquisitions (Summary of Consid

Acquisitions (Summary of Consideration Transferred to Acquire Businesses and Amounts of Identifiable Assets Acquired, Liabilities Assumed and Noncontrolling Interests) (Detail) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Fair value of consideration transferred:
Cash		$ 347,936
Notes issued to sellers		13,460
Fair value of operations exchanged		4,500
Consideration transferred		422,853
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Accounts receivable		13,264
Prepaid expenses and other current assets		2,586
Property and equipment		128,298
Other assets		487
Deferred revenue		(3,176)
Other long-term liabilities		(1,080)
Deferred income taxes		(50,283)
Total identifiable net assets		154,955
Goodwill		267,898	$ 2,867,148
Accounts Payable and Accrued Liabilities [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Accounts payable and accrued liabilities		(11,119)
Debt [Member]
Fair value of consideration transferred:
Liabilities incurred		56,957
Contingent Consideration [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Other long-term liabilities		(15)
Other Acquisition [Member]
Fair value of consideration transferred:
Cash			12,541
Consideration transferred			12,541
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Accounts receivable	$ 486		486
Prepaid expenses and other current assets	476		476
Property and equipment	2,782		2,782
Other assets	261		261
Deferred revenue	(610)		(610)
Total identifiable net assets	7,310		7,310
Goodwill			5,231
Other Acquisition [Member] | Accounts Payable and Accrued Liabilities [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Accounts payable and accrued liabilities	(741)		(741)
Other Acquisition [Member] | Contingent Consideration [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Other long-term liabilities	(345)		(345)
Progressive Waste Solutions Ltd. [Member]
Fair value of consideration transferred:
Shares issued	3,503,162
Less: cash acquired	(65,768)		(65,768)
Consideration transferred	5,232,436
Net fair value of consideration transferred	5,166,668
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Accounts receivable	231,709		231,709
Prepaid expenses and other current assets	28,623		28,623
Property and equipment	2,063,011		2,063,011
Other assets	4,491		4,491
Deferred revenue	(35,635)		(35,635)
Other long-term liabilities	(185,774)		(185,774)
Deferred income taxes	(329,552)		(329,552)
Total identifiable net assets	2,143,083		2,143,083
Goodwill	3,023,585
Progressive Waste Solutions Ltd. [Member] | Restricted Assets [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Other assets	16,551		16,551
Progressive Waste Solutions Ltd. [Member] | Accounts Payable and Accrued Liabilities [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Accounts payable and accrued liabilities	(264,992)		(264,992)
Progressive Waste Solutions Ltd. [Member] | Debt [Member]
Fair value of consideration transferred:
Liabilities incurred	1,729,274
Progressive Waste Solutions Ltd. [Member] | Contingent Consideration [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Other long-term liabilities	(19,412)		(19,412)
Contracts [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Intangibles		31,700
Contracts [Member] | Progressive Waste Solutions Ltd. [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Intangibles	223,885		223,885
Customer Lists [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Intangibles		17,032
Customer Lists [Member] | Other Acquisition [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Intangibles	5,001		5,001
Customer Lists [Member] | Progressive Waste Solutions Ltd. [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Intangibles	191,679		191,679
Other Intangibles [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Intangibles		$ 27,261
Other Intangibles [Member] | Progressive Waste Solutions Ltd. [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Intangibles	$ 218,499		$ 218,499

Acquisitions (Pro Forma Results

Acquisitions (Pro Forma Results of Operations) (Details) - Progressive Waste Solutions Ltd. [Member] $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2016USD ($)$ / shares
Business Acquisition [Line Items]
Total revenue | $	$ 2,051,327
Net income | $	$ 178,058
Basic income per share | $ / shares	$ 0.68
Diluted income per share | $ / shares	$ 0.67

Assets Held for Sale (Narrative

Assets Held for Sale (Narrative) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)
Assets Held for Sale [Abstract]
Proceeds from sale of assets	$ 25,532
Non-monetary consideration recieved for sale of operation	4,500
Loss recognized on assets held for sale	$ 43,873

Assets Held for Sale (Assets an

Assets Held for Sale (Assets and Liabilities Held for Sale) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets held for sale:
Cash and equivalents	$ 347	$ 42
Accounts receivable	7,405	5,726
Other current assets	979	571
Current assets held for sale	8,731	6,339
Long-term assets held for sale:
Property and equipment	62,211	33,624
Goodwill	17,215	244
Other assets	22	121
Long-term assets held for sale	79,448	33,989
Current liabilities held for sale:
Accounts payable	2,789	1,320
Accrued liabilities	885	1,811
Deferred revenue	2,691	252
Current liabilities held for sale	6,365	$ 3,383
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent [Abstract]
Other liabilities	$ 463

Goodwill and Intangible Asset46

Goodwill and Intangible Assets, Net (Narrative) (Detail) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017USD ($)segment	Dec. 31, 2016USD ($)	Jan. 01, 2017USD ($)	Jun. 30, 2016USD ($)	Dec. 31, 2015USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Number of operating segments | segment	6
Goodwill impairment charge	$ 77,343
Goodwill	4,589,573	$ 4,390,261		$ 4,299,463	$ 1,422,825
Property and equipment, net	4,729,335	4,738,055
Indefinite-lived intangible assets	$ 216,392	216,392
Long-term Franchise Agreements and Contracts [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period of acquired intangible assets	19 years 2 months 12 days
Customer Lists [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period of acquired intangible assets	10 years
Permits and Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period of acquired intangible assets	40 years
Exploration and Production [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value discount rate	11.70%
Goodwill impairment charge	$ 77,343	0
Goodwill		77,343	$ 77,343	$ 77,343	$ 77,343
Exploration and Production Facility Permits [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 21,348	$ 21,348

Goodwill and Intangible Asset47

Goodwill and Intangible Assets, Net (Intangible Assets Exclusive of Goodwill) (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	$ 1,155,006	$ 1,090,809
Intangible assets, exclusive of goodwill, gross	1,409,905	1,345,708
Indefinite-lived intangible assets, gross carrying amount	254,899	254,899
Finite-lived intangible assets, accumulated amortization	(287,611)	(240,043)
Intangible assets, accumulated impairment loss	(38,507)	(38,507)
Finite-lived intangible assets, net carrying amount	867,395	850,766
Intangible assets, net, exclusive of goodwill	1,083,787	1,067,158
Indefinite-lived intangible assets	216,392	216,392
Solid Waste Collection and Transportation Permits [Member]
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, gross carrying amount	152,761	152,761
Intangible assets, accumulated impairment loss
Indefinite-lived intangible assets	152,761	152,761
Material Recycling Facility Permits [Member]
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, gross carrying amount	42,283	42,283
Intangible assets, accumulated impairment loss
Indefinite-lived intangible assets	42,283	42,283
Exploration and Production Facility Permits [Member]
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, gross carrying amount	59,855	59,855
Intangible assets, accumulated impairment loss	(38,507)	(38,507)
Indefinite-lived intangible assets	21,348	21,348
Long-term Franchise Agreements and Contracts [Member]
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	452,025	428,783
Finite-lived intangible assets, accumulated amortization	(103,551)	(86,552)
Finite-lived intangible assets, net carrying amount	348,474	342,231
Customer Lists [Member]
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	387,209	371,203
Finite-lived intangible assets, accumulated amortization	(155,341)	(131,525)
Finite-lived intangible assets, net carrying amount	231,868	239,678
Permits and Other [Member]
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross carrying amount	315,772	290,823
Finite-lived intangible assets, accumulated amortization	(28,719)	(21,966)
Finite-lived intangible assets, net carrying amount	$ 287,053	$ 268,857

Goodwill and Intangible Asset48

Goodwill and Intangible Assets, Net (Estimated Future Amortization Expense of Amortizable Intangible Assets) (Detail) $ in Thousands	Jun. 30, 2017USD ($)
Goodwill and Intangible Assets, Net [Abstract]
For the year ending December 31, 2017	$ 100,344
For the year ending December 31, 2018	93,108
For the year ending December 31, 2019	83,147
For the year ending December 31, 2020	75,471
For the year ending December 31, 2021	$ 66,754

Long-Term Debt (Narrative) (Det

Long-Term Debt (Narrative) (Detail) - USD ($)		1 Months Ended	3 Months Ended	6 Months Ended
		Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016	Apr. 20, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long term debt			$ 3,991,860,000	$ 3,991,860,000			$ 3,632,692,000
Debt issuance costs				3,519,000	$ 12,941,000
Cash and cash equivalents		$ 55,624,000	399,741,000	399,741,000	$ 55,624,000		154,382,000	$ 10,974,000
Credit Agreement [Member] | Progressive Waste Solutions Ltd. [Member]
Debt Instrument [Line Items]
Liabilities incurred		1,659,465,000
Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long term debt	[1]		$ 256,995,000	$ 256,995,000			310,582,000
Credit Agreement [Member] | Minimum [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate	[1]		2.18%	2.18%
Credit Agreement [Member] | Maximum [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate	[1]		2.95%	2.95%
Tax-exempt Bonds [Member]
Debt Instrument [Line Items]
Long term debt	[1]		$ 95,430,000	$ 95,430,000			95,430,000
Tax-exempt Bonds [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate	[1]		0.97%	0.97%
Tax-exempt Bonds [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate	[1]		1.00%	1.00%
Notes Payable to Sellers and Other Third Parties [Member]
Debt Instrument [Line Items]
Long term debt	[1]		$ 26,935,000	$ 26,935,000			14,180,000
Notes Payable to Sellers and Other Third Parties [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate	[1]		2.00%	2.00%
Notes Payable to Sellers and Other Third Parties [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate	[1]		24.81%	24.81%
Senior Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount						$ 400,000,000
Senior Notes [Member] | Senior Notes due 2018 [Member]
Debt Instrument [Line Items]
Long term debt			$ 50,000,000	$ 50,000,000			$ 50,000,000
Interest rate			4.00%	4.00%			4.00%
Senior Notes [Member] | Senior Notes due 2019 [Member]
Debt Instrument [Line Items]
Long term debt			$ 175,000,000	$ 175,000,000			$ 175,000,000
Interest rate			5.25%	5.25%			5.25%
Senior Notes [Member] | Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Long term debt			$ 100,000,000	$ 100,000,000			$ 100,000,000
Interest rate			4.64%	4.64%			4.64%
Senior Notes [Member] | New Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Long term debt			$ 150,000,000	$ 150,000,000			$ 150,000,000
Interest rate			2.39%	2.39%			2.39%
Senior Notes [Member] | Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Long term debt			$ 125,000,000	$ 125,000,000			$ 125,000,000
Interest rate			3.09%	3.09%			3.09%
Senior Notes [Member] | Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Long term debt			$ 200,000,000	$ 200,000,000			$ 200,000,000
Interest rate			2.75%	2.75%			2.75%
Senior Notes [Member] | Senior Notes due 2024 [Member]
Debt Instrument [Line Items]
Long term debt			$ 150,000,000	$ 150,000,000
Maturity date			Apr. 20, 2024
Interest rate			3.24%	3.24%		3.24%
Aggregate principal amount						$ 150,000,000
Senior Notes [Member] | Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Long term debt			$ 375,000,000	$ 375,000,000			$ 375,000,000
Interest rate			3.41%	3.41%			3.41%
Senior Notes [Member] | Senior Notes due 2026 [Member]
Debt Instrument [Line Items]
Long term debt			$ 400,000,000	$ 400,000,000			$ 400,000,000
Interest rate			3.03%	3.03%			3.03%
Senior Notes [Member] | Senior Notes due 2027 [Member]
Debt Instrument [Line Items]
Long term debt			$ 250,000,000	$ 250,000,000
Maturity date			Apr. 20, 2027
Interest rate			3.49%	3.49%		3.49%
Aggregate principal amount						$ 250,000,000
Term Loan Facility [Member] | Credit Agreement [Member]
Debt Instrument [Line Items]
Long term debt	[1]		$ 1,637,500,000	$ 1,637,500,000			$ 1,637,500,000
Interest rate	[1]		2.43%	2.43%
Debt [Member]
Debt Instrument [Line Items]
Liabilities incurred				$ 56,957,000
Debt [Member] | Progressive Waste Solutions Ltd. [Member]
Debt Instrument [Line Items]
Liabilities incurred		1,729,274,000
Tax-exempt Bonds [Member] | Progressive Waste Solutions Ltd. [Member]
Debt Instrument [Line Items]
Liabilities incurred		64,000,000
Other Long-term Liabilities [Member} | Progressive Waste Solutions Ltd. [Member]
Debt Instrument [Line Items]
Liabilities incurred		$ 5,809,000
LIBOR [Member] | Credit Agreement [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Long term debt			$ 1,637,500,000	$ 1,637,500,000			$ 1,637,500,000
Interest rate			2.43%	2.43%			1.97%
Canadian Prime Rate [Member] | Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility outstanding			$ 11,559,000	$ 11,559,000			$ 7,448,000
Interest rate applicable			2.95%	2.95%			2.95%
Canadian Bankers Acceptance Loan [Member] | Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility outstanding			$ 245,436,000	$ 245,436,000			$ 303,134,000
Interest rate applicable			2.18%	2.18%			2.13%
United States Treasury Bills Rate [Member] | Senior Notes [Member] | Credit Agreement [Member]
Debt Instrument [Line Items]
Margin rate for loans				0.50%
[1]	Interest rates represent the interest rates incurred at June 30, 2017

Long-Term Debt (Long-Term Debt)

Long-Term Debt (Long-Term Debt) (Detail) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2017	Apr. 20, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total debt		$ 3,991,860		$ 3,632,692
Less - current portion		(11,511)		(1,650)
Less - debt issuance costs		(16,440)		(14,282)
Long-term debt and notes payable		3,963,909		3,616,760
Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	[1]	$ 256,995		310,582
Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate	[1]	2.18%
Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate	[1]	2.95%
Credit Agreement [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Total debt	[1]	$ 1,637,500		1,637,500
Interest rate	[1]	2.43%
Senior Notes due 2018 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Total debt		$ 50,000		$ 50,000
Interest rate		4.00%		4.00%
Debt instrument maturity date year		2,018
Senior Notes due 2019 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Total debt		$ 175,000		$ 175,000
Interest rate		5.25%		5.25%
Debt instrument maturity date year		2,019
Senior Notes due 2021 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Total debt		$ 100,000		$ 100,000
Interest rate		4.64%		4.64%
Debt instrument maturity date year		2,021
New Senior Notes due 2021 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Total debt		$ 150,000		$ 150,000
Interest rate		2.39%		2.39%
Debt instrument maturity date year		2,021
Senior Notes due 2022 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Total debt		$ 125,000		$ 125,000
Interest rate		3.09%		3.09%
Debt instrument maturity date year		2,022
Senior Notes due 2023 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Total debt		$ 200,000		$ 200,000
Interest rate		2.75%		2.75%
Debt instrument maturity date year		2,023
Senior Notes due 2024 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Total debt		$ 150,000
Interest rate		3.24%	3.24%
Debt instrument maturity date year		2,024
Senior Notes due 2025 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Total debt		$ 375,000		$ 375,000
Interest rate		3.41%		3.41%
Debt instrument maturity date year		2,025
Senior Notes due 2026 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Total debt		$ 400,000		$ 400,000
Interest rate		3.03%		3.03%
Debt instrument maturity date year		2,026
Senior Notes due 2027 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Total debt		$ 250,000
Interest rate		3.49%	3.49%
Debt instrument maturity date year		2,027
Tax-exempt Bonds [Member]
Debt Instrument [Line Items]
Total debt	[1]	$ 95,430		$ 95,430
Tax-exempt Bonds [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate	[1]	0.97%
Tax-exempt Bonds [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate	[1]	1.00%
Notes Payable to Sellers and Other Third Parties [Member]
Debt Instrument [Line Items]
Total debt	[1]	$ 26,935		$ 14,180
Notes Payable to Sellers and Other Third Parties [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate	[1]	2.00%
Notes Payable to Sellers and Other Third Parties [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate	[1]	24.81%
[1]	Interest rates represent the interest rates incurred at June 30, 2017

Long-Term Debt (Details of the

Long-Term Debt (Details of the Company's Credit Agreement) (Details) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Jun. 30, 2017	Dec. 31, 2016
Line of Credit Facility [Line Items]
Amount drawn		$ 3,991,860	$ 3,632,692
Revolving Credit Facility [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
Available		$ 1,089,603	$ 1,004,451
Commitment - rate applicable		0.15%	0.15%
Amount drawn	[1]	$ 256,995	$ 310,582
Letter of Credit [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
Letter of credit		215,902	247,467
LIBOR [Member] | Term Loan Facility [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
Amount drawn		$ 1,637,500	$ 1,637,500
Interest rate applicable		2.43%	1.97%
Canadian Prime Rate [Member] | Revolving Credit Facility [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
Amount drawn		$ 11,559	$ 7,448
Interest rate applicable		2.95%	2.95%
Canadian Bankers Acceptance Loan [Member] | Revolving Credit Facility [Member] | Credit Agreement [Member]
Line of Credit Facility [Line Items]
Amount drawn		$ 245,436	$ 303,134
Interest rate applicable		2.18%	2.13%
[1]	Interest rates represent the interest rates incurred at June 30, 2017

Segment Reporting (Narrative) (

Segment Reporting (Narrative) (Detail)	6 Months Ended
	Jun. 30, 2017customersegment
Segment Reporting [Abstract]
Number of contracts or customers accounted for more than 10% of the Company's total revenues at the consolidated or reportable segment level | customer	0
Number of operating segments	6
Number of reportable segments	6

Segment Reporting (Summary of F

Segment Reporting (Summary of Financial Information Concerning Company's Reportable Segments) (Detail) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2017USD ($)		Jun. 30, 2016USD ($)		Jun. 30, 2017USD ($)segment	Jun. 30, 2016USD ($)
Segment Reporting Information [Line Items]
Revenue		$ 1,175,569		$ 727,639		$ 2,266,835	$ 1,242,319
Segment EBITDA	[1]	363,319		158,640		$ 682,154	318,447
Number of operating segments | segment						6
Intercompany Revenue [Member]
Segment Reporting Information [Line Items]
Revenue	[2]	(166,906)		(103,367)		$ (318,486)	(173,727)
Reportable Segments [Member]
Segment Reporting Information [Line Items]
Revenue		1,342,475		831,006		2,585,321	1,416,046
Segment EBITDA		374,481		234,505		708,937	402,800
Southern [Member]
Segment Reporting Information [Line Items]
Revenue		285,383		120,551		565,505	157,470
Segment EBITDA	[1]	67,168		27,228		136,108	36,717
Southern [Member] | Intercompany Revenue [Member]
Segment Reporting Information [Line Items]
Revenue	[2]	(37,725)		(16,618)		(74,942)	(22,665)
Southern [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Revenue		323,108		137,169		640,447	180,135
Western [Member]
Segment Reporting Information [Line Items]
Revenue		257,492		236,431		493,082	455,664
Segment EBITDA	[1]	87,045		79,835		162,613	153,625
Western [Member] | Intercompany Revenue [Member]
Segment Reporting Information [Line Items]
Revenue	[2]	(31,461)		(29,480)		(59,872)	(57,111)
Western [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Revenue		288,953		265,911		552,954	512,775
Eastern [Member]
Segment Reporting Information [Line Items]
Revenue		246,310		142,584		477,797	250,380
Segment EBITDA	[1]	72,095		44,824		137,546	79,438
Eastern [Member] | Intercompany Revenue [Member]
Segment Reporting Information [Line Items]
Revenue	[2]	(46,017)		(26,240)		(87,827)	(46,660)
Eastern [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Revenue		292,327		168,824		565,624	297,040
Canada [Member]
Segment Reporting Information [Line Items]
Revenue		180,297		60,585		343,333	60,585
Segment EBITDA	[1]	66,365		23,555		123,665	23,555
Canada [Member] | Intercompany Revenue [Member]
Segment Reporting Information [Line Items]
Revenue	[2]	(26,332)		(9,518)		(48,627)	(9,518)
Canada [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Revenue		206,629		70,103		391,960	70,103
Central [Member]
Segment Reporting Information [Line Items]
Revenue		159,418	[3]	139,670	[3]	303,727	259,607
Segment EBITDA	[1]	60,716	[3]	52,578	[3]	113,368	96,431
Central [Member] | Intercompany Revenue [Member]
Segment Reporting Information [Line Items]
Revenue	[2]	(23,363)	[3]	(18,327)	[3]	(42,866)	(32,288)
Central [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Revenue		182,781	[3]	157,997	[3]	346,593	291,895
Exploration and Production [Member]
Segment Reporting Information [Line Items]
Revenue		46,669		27,818		83,391	58,613
Segment EBITDA	[1]	21,092		6,485		35,637	13,034
Exploration and Production [Member] | Intercompany Revenue [Member]
Segment Reporting Information [Line Items]
Revenue	[2]	(2,008)		(3,184)		(4,352)	(5,485)
Exploration and Production [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Revenue		48,677		31,002		87,743	64,098
Corporate [Member]
Segment Reporting Information [Line Items]
Revenue	[3]
Segment EBITDA	[1]	$ (11,162)	[3]	(75,865)	[3]	$ (26,783)	$ (84,353)	[3]
Corporate [Member] | Intercompany Revenue [Member]
Segment Reporting Information [Line Items]
Revenue	[2],[3]
Corporate [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Revenue	[3]
[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 and other administrative functions. Amounts reflected are net of allocations to the six operating segments.

Segment Reporting (Total Assets

Segment Reporting (Total Assets for Reportable Segments) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Assets	$ 11,655,363	$ 11,103,925
Southern [Member]
Segment Reporting Information [Line Items]
Assets	2,801,661	2,869,841
Western [Member]
Segment Reporting Information [Line Items]
Assets	1,518,397	1,516,870
Eastern [Member]
Segment Reporting Information [Line Items]
Assets	1,944,737	1,541,854
Canada [Member]
Segment Reporting Information [Line Items]
Assets	2,583,098	2,532,046
Central [Member]
Segment Reporting Information [Line Items]
Assets	1,304,610	1,302,900
Exploration and Production [Member]
Segment Reporting Information [Line Items]
Assets	986,957	1,068,086
Corporate [Member]
Segment Reporting Information [Line Items]
Assets	$ 515,903	$ 272,328

Segment Reporting (Changes in G

Segment Reporting (Changes in Goodwill by Reportable Segment) (Detail) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 4,390,261	$ 1,422,825	$ 1,422,825
Goodwill acquired	267,898	2,867,148
Impairment loss	(77,343)
Goodwill adjustment for assets sold	2,526
Impairment loss related to assets held for sale	(27,311)
Goodwill reclassified as assets held for sale	(17,215)
Impact of changes in foreign currency	50,757	9,490
Goodwill, Ending Balance	4,589,573	4,299,463	4,390,261
Southern [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	1,470,023	95,710	95,710
Goodwill acquired	10,335	1,241,419
Goodwill adjustment for assets sold	2,205
Impairment loss related to assets held for sale	(27,311)
Goodwill reclassified as assets held for sale	(17,215)
Goodwill, Ending Balance	1,438,037	1,337,129	1,470,023
Western [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	376,537	373,820	373,820
Goodwill acquired		2,673
Goodwill, Ending Balance	376,537	376,493	376,537
Eastern [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	533,160	459,532	459,532
Goodwill acquired	249,724	70,723
Goodwill adjustment for assets sold	321
Goodwill, Ending Balance	783,205	530,255	533,160
Canada [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	1,465,274
Goodwill acquired	7,128	1,510,220
Impact of changes in foreign currency	50,757	9,490
Goodwill, Ending Balance	1,523,159	1,519,710	1,465,274
Central [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	467,924	416,420	416,420
Goodwill acquired	711	42,113
Goodwill, Ending Balance	468,635	458,533	467,924
Exploration and Production [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	77,343	77,343	77,343
Impairment loss	$ (77,343)		0
Goodwill, Ending Balance		$ 77,343	$ 77,343

Segment Reporting (Reconciliati

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, 2017		Jun. 30, 2016		Jun. 30, 2017	Jun. 30, 2016
Segment EBITDA	[1]	$ 363,319		$ 158,640		$ 682,154	$ 318,447
Depreciation		(132,827)		(84,348)		(258,067)	(145,245)
Amortization of intangibles		(24,762)		(14,081)		(50,272)	(21,775)
Impairments and other operating items		1,180		3,284		(140,501)	3,048
Interest expense		(31,160)		(20,485)		(60,291)	(37,670)
Other income (expense), net		1,860		(714)		3,326	(492)
Foreign currency transaction gain (loss)		(1,048)		689		(1,638)	689
Income before income tax provision		176,562		42,985		174,711	117,002
Southern [Member]
Segment EBITDA	[1]	67,168		27,228		136,108	36,717
Western [Member]
Segment EBITDA	[1]	87,045		79,835		162,613	153,625
Eastern [Member]
Segment EBITDA	[1]	72,095		44,824		137,546	79,438
Canada [Member]
Segment EBITDA	[1]	66,365		23,555		123,665	23,555
Central [Member]
Segment EBITDA	[1]	60,716	[2]	52,578	[2]	113,368	96,431
Exploration and Production [Member]
Segment EBITDA	[1]	21,092		6,485		35,637	13,034
Corporate [Member]
Segment EBITDA	[1]	(11,162)	[2]	(75,865)	[2]	(26,783)	(84,353)	[2]
Reportable Segments [Member]
Segment EBITDA		$ 374,481		$ 234,505		$ 708,937	$ 402,800
[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.

Segment Reporting (Total Report

Segment Reporting (Total Reported Revenues by Service Line) (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue from External Customer [Line Items]
Revenues		$ 1,175,569	$ 727,639	$ 2,266,835	$ 1,242,319
Percentage of reported revenue		100.00%	100.00%	100.00%	100.00%
Solid Waste Collection [Member]
Revenue from External Customer [Line Items]
Revenues		$ 794,739	$ 501,170	$ 1,560,886	$ 856,447
Percentage of reported revenue		67.60%	68.90%	68.90%	68.90%
Solid Waste Disposal and Transfer [Member]
Revenue from External Customer [Line Items]
Revenues		$ 257,239	$ 160,032	$ 470,823	$ 264,080
Percentage of reported revenue		21.90%	22.00%	20.80%	21.30%
Solid Waste Recycling [Member]
Revenue from External Customer [Line Items]
Revenues		$ 41,342	$ 16,726	$ 82,646	$ 26,707
Percentage of reported revenue		3.50%	2.30%	3.60%	2.10%
E&P Waste Treatment, Recovery and Disposal [Member]
Revenue from External Customer [Line Items]
Revenues		$ 47,173	$ 27,481	$ 84,026	$ 57,966
Percentage of reported revenue		4.00%	3.80%	3.70%	4.70%
Intermodal and Other [Member]
Revenue from External Customer [Line Items]
Revenues		$ 35,076	$ 22,230	$ 68,454	$ 37,119
Percentage of reported revenue		3.00%	3.00%	3.00%	3.00%
Intercompany Revenue [Member]
Revenue from External Customer [Line Items]
Revenues	[1]	$ (166,906)	$ (103,367)	$ (318,486)	$ (173,727)
Intercompany Revenue [Member] | Solid Waste Collection [Member]
Revenue from External Customer [Line Items]
Revenues		(2,392)	(1,778)	(4,592)	(3,099)
Intercompany Revenue [Member] | Solid Waste Disposal and Transfer [Member]
Revenue from External Customer [Line Items]
Revenues		(158,937)	(96,815)	(302,378)	(162,849)
Intercompany Revenue [Member] | Solid Waste Recycling [Member]
Revenue from External Customer [Line Items]
Revenues		(2,351)	(1,393)	(4,935)	(2,031)
Intercompany Revenue [Member] | E&P Waste Treatment, Recovery and Disposal [Member]
Revenue from External Customer [Line Items]
Revenues		(2,870)	(3,253)	(5,838)	(5,620)
Intercompany Revenue [Member] | Intermodal and Other [Member]
Revenue from External Customer [Line Items]
Revenues		(356)	(128)	(743)	(128)
Reportable Segments [Member]
Revenue from External Customer [Line Items]
Revenues		1,342,475	831,006	2,585,321	1,416,046
Reportable Segments [Member] | Solid Waste Collection [Member]
Revenue from External Customer [Line Items]
Revenues		797,131	502,948	1,565,478	859,546
Reportable Segments [Member] | Solid Waste Disposal and Transfer [Member]
Revenue from External Customer [Line Items]
Revenues		416,176	256,847	773,201	426,929
Reportable Segments [Member] | Solid Waste Recycling [Member]
Revenue from External Customer [Line Items]
Revenues		43,693	18,119	87,581	28,738
Reportable Segments [Member] | E&P Waste Treatment, Recovery and Disposal [Member]
Revenue from External Customer [Line Items]
Revenues		50,043	30,734	89,864	63,586
Reportable Segments [Member] | Intermodal and Other [Member]
Revenue from External Customer [Line Items]
Revenues		$ 35,432	$ 22,358	$ 69,197	$ 37,247
[1]	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.

Derivative Financial Instrume58

Derivative Financial Instruments (Narrative) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)agreement	Jun. 30, 2016USD ($)
Derivative Financial Instruments [Abstract]
Number of interest rate swap agreements	11
Number of fuel hedge agreements	4
Ineffectiveness recognized on the fuel hedges | $	$ 0	$ 0

Derivative Financial Instrume59

Derivative Financial Instruments (Company's Derivative Instruments of Interest Rate Swaps) (Details) - LIBOR [Member] $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)
Interest Rate Swap One [Member]
Derivative [Line Items]
Date entered	2014-04
Notional amount	$ 100,000
Fixed interest rate paid	1.80%	[1]
Variable interest rate received	1-month LIBOR
Effective date	2014-07
Expiration date	2019-07
Interest Rate Swap Two [Member]
Derivative [Line Items]
Date entered	2014-05
Notional amount	$ 50,000
Fixed interest rate paid	2.344%	[1]
Variable interest rate received	1-month LIBOR
Effective date	2015-10
Expiration date	2020-10
Interest Rate Swap Three [Member]
Derivative [Line Items]
Date entered	2014-05
Notional amount	$ 25,000
Fixed interest rate paid	2.326%	[1]
Variable interest rate received	1-month LIBOR
Effective date	2015-10
Expiration date	2020-10
Interest Rate Swap Four [Member]
Derivative [Line Items]
Date entered	2014-05
Notional amount	$ 50,000
Fixed interest rate paid	2.35%	[1]
Variable interest rate received	1-month LIBOR
Effective date	2015-10
Expiration date	2020-10
Interest Rate Swap Five [Member]
Derivative [Line Items]
Date entered	2014-05
Notional amount	$ 50,000
Fixed interest rate paid	2.35%	[1]
Variable interest rate received	1-month LIBOR
Effective date	2015-10
Expiration date	2020-10
Interest Rate Swap Six [Member]
Derivative [Line Items]
Date entered	2016-04
Notional amount	$ 100,000
Fixed interest rate paid	1.00%	[1]
Variable interest rate received	1-month LIBOR
Effective date	2017-02
Expiration date	2020-02
Interest Rate Swap Seven [Member]
Derivative [Line Items]
Date entered	2016-06
Notional amount	$ 75,000
Fixed interest rate paid	0.85%	[1]
Variable interest rate received	1-month LIBOR
Effective date	2017-02
Expiration date	2020-02
Interest Rate Swap Eight [Member]
Derivative [Line Items]
Date entered	2016-06
Notional amount	$ 150,000
Fixed interest rate paid	0.95%	[1]
Variable interest rate received	1-month LIBOR
Effective date	2018-01
Expiration date	2021-01
Interest Rate Swap Nine [Member]
Derivative [Line Items]
Date entered	2016-06
Notional amount	$ 150,000
Fixed interest rate paid	0.95%	[1]
Variable interest rate received	1-month LIBOR
Effective date	2018-01
Expiration date	2021-01
Interest Rate Swap Ten [Member]
Derivative [Line Items]
Date entered	2016-07
Notional amount	$ 50,000
Fixed interest rate paid	0.90%	[1]
Variable interest rate received	1-month LIBOR
Effective date	2018-01
Expiration date	2021-01
Interest Rate Swap Eleven [Member]
Derivative [Line Items]
Date entered	2016-07
Notional amount	$ 50,000
Fixed interest rate paid	0.89%	[1]
Variable interest rate received	1-month LIBOR
Effective date	2018-01
Expiration date	2021-01
[1]	Plus applicable margin.

Derivative Financial Instrume60

Derivative Financial Instruments (Company's Derivative Instruments of Fuel Hedge Agreements) (Details) - Fuel [Member]	6 Months Ended
	Jun. 30, 2017gal / M$ / gal
Fuel Hedge Agreement One [Member]
Derivative [Line Items]
Date entered	2015-05
Notional amount (in gallons per month) | gal / M	300,000
Diesel rate paid fixed (per gallon) | $ / gal	3.2800
Diesel rate received variable	DOE Diesel Fuel Index*	[1]
Effective date	2016-01
Expiration date	2017-12
Fuel Hedge Agreement Two [Member]
Derivative [Line Items]
Date entered	2015-05
Notional amount (in gallons per month) | gal / M	200,000
Diesel rate paid fixed (per gallon) | $ / gal	3.2750
Diesel rate received variable	DOE Diesel Fuel Index*	[1]
Effective date	2016-01
Expiration date	2017-12
Fuel Hedge Agreement Three [Member]
Derivative [Line Items]
Date entered	2016-07
Notional amount (in gallons per month) | gal / M	500,000
Diesel rate paid fixed (per gallon) | $ / gal	2.4988
Diesel rate received variable	DOE Diesel Fuel Index*	[1]
Effective date	2017-01
Expiration date	2017-12
Fuel Hedge Agreement Four [Member]
Derivative [Line Items]
Date entered	2016-07
Notional amount (in gallons per month) | gal / M	1,000,000
Diesel rate paid fixed (per gallon) | $ / gal	2.6345
Diesel rate received variable	DOE Diesel Fuel Index*	[1]
Effective date	2018-01
Expiration date	2018-12
[1]	If the national U.S. on-highway average price for a gallon of diesel fuel ("average price"), as published by the U.S. Department of Energy ("DOE"), exceeds the contract price per gallon, the Company receives the difference between the average price and the contract price (multiplied by the notional number of gallons) from the counterparty. If the average price is less than the contract price per gallon, the Company pays the difference to the counterparty.

Derivative Financial Instrume61

Derivative Financial Instruments (Fair Values of Derivative Instruments Designated as Cash Flow Hedges) (Details) - USD ($) $ in Thousands	Jun. 30, 2017		Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow hedges, asset derivatives	$ 12,599		$ 16,943
Derivatives designated as cash flow hedges, liability derivatives	(6,972)		(8,868)
Interest Rate Swap [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow hedges, liability derivatives	(2,411)	[1]	(3,260)
Interest Rate Swap [Member] | Other Long-term Liabilities [Member}
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow hedges, liability derivatives	(1,781)		(2,350)
Interest Rate Swap [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow hedges, asset derivatives	1,428	[1]	127
Interest Rate Swap [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow hedges, asset derivatives	11,068		13,822
Fuel [Member] | Commodity Contract [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow hedges, liability derivatives	(2,606)	[2]	(3,258)
Fuel [Member] | Commodity Contract [Member] | Other Long-term Liabilities [Member}
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow hedges, liability derivatives	(174)
Fuel [Member] | Commodity Contract [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow hedges, asset derivatives	$ 103	[2]	1,343
Fuel [Member] | Commodity Contract [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow hedges, asset derivatives			$ 1,651
[1]	Represents the estimated amount of the existing unrealized gains and losses, respectively, on interest rate swaps as of June 30, 2017 (based on the interest rate yield curve at that date), included in AOCIL expected to be reclassified into pre-tax earnings within the next 12 months. The actual amounts reclassified into earnings are dependent on future movements in interest rates.
[2]	Represents the estimated amount of the existing unrealized gains and losses, respectively, on fuel hedges as of June 30, 2017 (based on the forward DOE diesel fuel index curve at that date), included in AOCIL expected to be reclassified into pre-tax earnings within the next 12 months. The actual amounts reclassified into earnings are dependent on future movements in diesel fuel prices.

Derivative Financial Instrume62

Derivative Financial Instruments (Impact of Cash Flow Hedges on Results of Operations, Comprehensive Income and Accumulated Other Comprehensive Loss) (Details) - Cash Flow Hedging [Member] - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized as AOCL on derivatives, net of tax (effective portion)	[1]	$ (4,818)	$ (1,335)	$ (4,093)	$ (6,283)
Amount of (gain) or loss reclassified from AOCL into earnings, net of tax (effective portion)	[2],[3]	1,184	1,958	2,575	4,130
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (gain) or loss reclassified from AOCL into earnings, net of tax (effective portion)	[2],[3]	558	1,047	1,353	2,105
Cost Of Operations [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (gain) or loss reclassified from AOCL into earnings, net of tax (effective portion)	[2],[3]	626	911	1,222	2,025
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized as AOCL on derivatives, net of tax (effective portion)	[1]	(4,098)	(2,352)	(1,379)	(6,493)
Fuel [Member] | Commodity Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized as AOCL on derivatives, net of tax (effective portion)	[1]	$ (720)	$ 1,017	$ (2,714)	$ 210
[1]	In accordance with the derivatives and hedging guidance, the effective portions of the changes in fair values of interest rate swaps and fuel hedges have been recorded in equity as a component of AOCIL. As the critical terms of the interest rate swaps match the underlying debt being hedged, no ineffectiveness is recognized on these swaps and, therefore, all unrealized changes in fair value are recorded in AOCIL. Because changes in the actual price of diesel fuel and changes in the DOE index price do not offset exactly each reporting period, the Company assesses whether the fuel hedges are highly effective using the cumulative dollar offset approach.
[2]	Amounts reclassified from AOCIL into earnings related to realized gains and losses on interest rate swaps are recognized when interest payments or receipts occur related to the swap contracts, which correspond to when interest payments are made on the Company's hedged debt.
[3]	Amounts reclassified from AOCIL into earnings related to realized gains and losses on the fuel hedges are recognized when settlement payments or receipts occur related to the hedge contracts, which correspond to when the underlying fuel is consumed.

Fair Value of Financial Instr63

Fair Value of Financial Instruments (Carrying Values and Fair Values of Debt Instruments) (Detail) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Carrying value of senior notes		$ 3,991,860	$ 3,632,692
Senior Notes [Member] | 4.00% Senior Notes Due 2018 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes		50,000	50,000
Fair value of senior notes	[1]	$ 50,734	$ 51,226
Interest rate of senior notes		4.00%	4.00%
Senior note year due		2,018
Senior Notes [Member] | 5.25% Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes		$ 175,000	$ 175,000
Fair value of senior notes	[1]	$ 186,411	$ 187,671
Interest rate of senior notes		5.25%	5.25%
Senior note year due		2,019
Senior Notes [Member] | 4.64% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes		$ 100,000	$ 100,000
Fair value of senior notes	[1]	$ 106,979	$ 106,618
Interest rate of senior notes		4.64%	4.64%
Senior note year due		2,021
Senior Notes [Member] | 2.39% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes		$ 150,000	$ 150,000
Fair value of senior notes	[1]	$ 148,267	$ 146,168
Interest rate of senior notes		2.39%	2.39%
Senior note year due		2,021
Senior Notes [Member] | 3.09% Senior Notes Due 2022 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes		$ 125,000	$ 125,000
Fair value of senior notes	[1]	$ 126,099	$ 123,974
Interest rate of senior notes		3.09%	3.09%
Senior note year due		2,022
Senior Notes [Member] | 2.75% Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes		$ 200,000	$ 200,000
Fair value of senior notes	[1]	$ 196,690	$ 192,238
Interest rate of senior notes		2.75%	2.75%
Senior note year due		2,023
Senior Notes [Member] | 3.24% Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes		$ 150,000
Fair value of senior notes	[1]	$ 150,597
Interest rate of senior notes		3.24%
Senior note year due		2,024
Senior Notes [Member] | 3.41% Senior Notes Due 2025 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes		$ 375,000	$ 375,000
Fair value of senior notes	[1]	$ 378,842	$ 368,968
Interest rate of senior notes		3.41%	3.41%
Senior note year due		2,025
Senior Notes [Member] | 3.03% Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes		$ 400,000	$ 400,000
Fair value of senior notes	[1]	$ 391,387	$ 379,438
Interest rate of senior notes		3.03%	3.03%
Senior note year due		2,026
Senior Notes [Member] | 3.49% Senior Notes Due 2027 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes		$ 250,000
Fair value of senior notes	[1]	$ 251,601
Interest rate of senior notes		3.49%
Senior note year due		2,027
[1]	Senior Notes are classified as Level 2 within the fair value hierarchy. Fair value is based on quotes of bonds with similar ratings in similar industries.

Net Income Per Share Informat64

Net Income Per Share Information (Basic and Diluted Net Income Per Common Share) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator:
Net income attributable to Waste Connections for basic and diluted earnings per share	$ 123,656	$ 27,489	$ 138,530	$ 72,331
Denominator:
Basic shares outstanding	263,387,338	210,305,335	263,225,541	197,244,873
Diluted shares outstanding	264,109,594	210,880,732	264,007,307	198,036,792

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Detail) - $ / gal	Jun. 30, 2017	Dec. 31, 2016
Fair Value [Abstract]
Minimum range of DOE index curve used in DCF model	2.51	2.61
Maximum range of DOE index curve used in DCF model	2.62	2.78
Weighted average DOE index curve used in DCF model	2.57	2.75

Fair Value Measurements (Assets

Fair Value Measurements (Assets and Liabilities Measured at Fair Value on Recurring Basis) (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted assets	$ 58,985	$ 57,166
Contingent consideration	(58,315)	(51,826)
Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instrument - net	8,304	8,339
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted assets	58,985	57,166
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instrument - net	8,304	8,339
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	(58,315)	(51,826)
Fuel [Member] | Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instrument - net	(2,677)	(264)
Fuel [Member] | Fair Value, Inputs, Level 3 [Member] | Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instrument - net	$ (2,677)	$ (264)

Fair Value Measurements (Change

Fair Value Measurements (Change in Fair Value for Level 3 Derivatives) (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Fair Value [Abstract]
Beginning balance	$ (264)	$ (9,900)
Realized losses included in earnings	1,976	3,274
Unrealized losses included in AOCL	(4,389)	324
Ending balance	$ (2,677)	$ (6,302)

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value for Level 3 Liabilities) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Fair Value [Abstract]
Beginning balance	$ 51,826	$ 49,394
Contingent consideration recorded at acquisition date	15	13,110
Payment of contingent consideration recorded at acquisition date	(5,565)	(4,109)
Payment of contingent consideration recorded in earnings		(132)
Adjustments to contingent consideration	11,013	(2,495)
Interest accretion expense	1,026	756
Ending balance	$ 58,315	$ 56,524

Other Comprehensive Income (L69

Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Components of Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation adjustment, gross	$ 53,193	$ 12,651	$ 70,627	$ 12,651
Other comprehensive income (loss), gross total	50,897	13,620	68,179	9,138
Foreign currency translation adjustment, tax
Income tax benefit related to items of other comprehensive loss	(1,338)	(346)	930	1,360
Amounts reclassified, net of tax			2,575	4,130
Changes in fair value, net of tax			(4,093)	(6,283)
Foreign currency translation adjustment, net	53,193	12,651	70,627	12,651
Other comprehensive income (loss), total, net of tax	49,559	13,274	69,109	10,498
Interest Rate Swap [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified, gross	760	1,693	1,841	3,403
Changes in fair value, gross	(2,904)	(3,826)	(1,876)	(10,514)
Amounts reclassified, tax effect	(202)	(646)	(488)	(1,298)
Changes in fair value, tax effect	(1,194)	1,474	497	4,021
Amounts reclassified, net of tax	558	1,047	1,353	2,105
Changes in fair value, net of tax	(4,098)	(2,352)	(1,379)	(6,493)
Fuel [Member] | Commodity Contract [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified, gross	1,012	1,473	1,976	3,274
Changes in fair value, gross	(1,164)	1,629	(4,389)	324
Amounts reclassified, tax effect	(386)	(562)	(754)	(1,249)
Changes in fair value, tax effect	444	(612)	1,675	(114)
Amounts reclassified, net of tax	626	911	1,222	2,025
Changes in fair value, net of tax	$ (720)	$ 1,017	$ (2,714)	$ 210

Other Comprehensive Income (L70

Other Comprehensive Income (Loss) (Amounts Included in Accumulated Other Comprehensive Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Components of Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ (43,001)	$ (12,171)
Amounts reclassified into earnings			2,575	4,130
Changes in fair value			(4,093)	(6,283)
Foreign currency translation adjustment	$ 53,193	$ 12,651	70,627	12,651
Ending balance	26,108	(1,673)	26,108	(1,673)
Interest Rate Swap [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Beginning balance			8,094	(6,037)
Amounts reclassified into earnings	558	1,047	1,353	2,105
Changes in fair value	(4,098)	(2,352)	(1,379)	(6,493)
Ending balance	8,068	(10,425)	8,068	(10,425)
Foreign Currency Translation Adjustment [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(50,931)
Foreign currency translation adjustment			70,627	12,651
Ending balance	19,696	12,651	19,696	12,651
Fuel [Member] | Commodity Contract [Member]
Components of Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(164)	(6,134)
Amounts reclassified into earnings	626	911	1,222	2,025
Changes in fair value	(720)	1,017	(2,714)	210
Ending balance	$ (1,656)	$ (3,899)	$ (1,656)	$ (3,899)

Shareholders' Equity (Narrative

Shareholders' Equity (Narrative) (Detail) $ / shares in Units, $ in Thousands	Jul. 19, 2016shares	Oct. 31, 2016$ / shares	Sep. 30, 2016$ / shares	Jul. 31, 2016shares	Jun. 30, 2017USD ($)$ / sharesshares	Jun. 30, 2016$ / sharesshares	Jun. 30, 2017USD ($)$ / sharesshares	Jun. 30, 2016USD ($)$ / sharesshares	Jun. 30, 2017USD ($)shares	Dec. 31, 2016shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock split description							On April 26, 2017, the Company announced that its Board of Directors approved a split of its common shares on a three-for-two basis, which was approved by its shareholders at the Company's Annual and Special Meeting of Shareholders of Waste Connections on May 23, 2017. Shareholders of record on June 7, 2017 received from the Company's transfer agent on June 16, 2017, one additional common share for every two common shares held. All share and per share amounts for all periods presented have been retroactively adjusted to reflect the share split.
Stockholders equity stock conversion ratio					1.5
Shares issued					263,637,093		263,637,093		263,637,093	263,140,777
Other long-term liabilities | $					$ 1,080		$ 1,080		$ 1,080
Maximum number of shares authorized for repurchase	13,156,098
Period for share repurchase program	1 year
Share repurchase plan expiration date	Aug. 7, 2017
Daily repurchase of shares, maximum				90,225
Average daily trading volume during period				360,901
Repurchase of common stock (shares)							0	0
Cash dividend per share | $ / shares		$ 0.12	$ 0.097		$ 0.12	$ 0.097	$ 0.24	$ 0.193
Cash dividend per common share, increase | $ / shares		$ 0.023
Cash dividends on common stock | $							$ 63,463	$ 35,585
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value of award | $ / shares							$ 56.99
Shares outstanding					1,070,073		1,070,073		1,070,073	1,252,291
Units granted in period							413,179
Units forfeited in period							26,483
Vested deferred RSUs outstanding					352,263	366,337	352,263	366,337	352,263
Restricted Stock Units (RSUs) [Member] | Progressive Waste Solutions Ltd. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted in period									0
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value of award | $ / shares							$ 57.47
Vesting period of award							3 years
Performance period end date							Dec. 31, 2019
Shares outstanding					514,461		514,461		514,461	427,144
Units granted in period							210,103
Performance Shares [Member] | Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of award							4 years
Performance Shares [Member] | Progressive Waste Solutions Ltd. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted in period									0
Performance Shares [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of award							1 year
Employee Stock Option [Member] | Progressive Waste Solutions Ltd. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period									0

Shareholders' Equity (Summary o

Shareholders' Equity (Summary of Activity Related to Restricted Stock Units) (Detail)	6 Months Ended
	Jun. 30, 2017$ / sharesshares
Restricted Stock Units (RSUs) [Member]
Unvested shares
Outstanding, shares at December 31, 2016	1,252,291
Granted	413,179
Forfeited	(26,483)
Vested and issued	(534,881)
Vested and deferred	(34,033)
Outstanding at June 30, 2017	352,263
Outstanding, shares at June 30, 2017	1,070,073
Weighted-Average Grant Date Fair Value Per Share
Granted | $ / shares	$ 56.99
Performance Shares [Member]
Unvested shares
Outstanding, shares at December 31, 2016	427,144
Granted	210,103
Vested and issued	(122,786)
Outstanding, shares at June 30, 2017	514,461
Weighted-Average Grant Date Fair Value Per Share
Granted | $ / shares	$ 57.47
Progressive Waste Solutions Ltd. [Member] | Restricted Stock Units (RSUs) [Member]
Unvested shares
Outstanding at December 31, 2016	269,233
Cash settled	(65,211)
Outstanding at June 30, 2017	204,022
Progressive Waste Solutions Ltd. [Member] | Performance Shares [Member]
Unvested shares
Outstanding at December 31, 2016	92,957
Cash settled	(37,164)
Outstanding at June 30, 2017	55,793
Deferred Compensation, Share-based Payments [Member]
Unvested shares
Outstanding at December 31, 2016	68,942
Granted	4,725
Share settled	(35,416)
Cash settled	(25,113)
Outstanding at June 30, 2017	13,138

Shareholders' Equity (Summary73

Shareholders' Equity (Summary of Vesting Activity Related to Restricted Share Units) (Details) - Progressive Waste Solutions Ltd. [Member]	6 Months Ended
	Jun. 30, 2017shares
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vested at December 31, 2016	222,517
Vested over remaining service period	13,373
Cash settled	(65,211)
Vested at June 30, 2017	170,679
Performance Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vested at December 31, 2016	35,727
Vested over remaining service period	8,042
Cash settled	(37,164)
Vested at June 30, 2017	6,605

Shareholders' Equity (Summary74

Shareholders' Equity (Summary of Stock Option Activity and Related Information) (Detail) - Progressive Waste Solutions Ltd. [Member]	6 Months Ended
	Jun. 30, 2017shares
Number of Shares (Options)
Outstanding at December 31, 2016	672,996
Forfeited	(9,662)
Share settled	(33,792)
Cash settled	(322,785)
Outstanding at June 30, 2017	306,757

Shareholders' Equity (Summary75

Shareholders' Equity (Summary of Vesting Activity Related to Share Based Options) (Details) - Progressive Waste Solutions Ltd. [Member]	6 Months Ended
	Jun. 30, 2017shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share settled	(33,792)
Cash settled	(322,785)
Forfeited	(9,662)
Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vested at December 31, 2016	601,395
Share based options vested in period	71,601
Share settled	(33,792)
Cash settled	(322,785)
Forfeited	(9,662)
Vested at June 30, 2017	306,757

Commitments and Contingencies (

Commitments and Contingencies (Narrative) (Detail) $ in Thousands, T in Millions	Apr. 19, 2017T	Jun. 30, 2017aftT	Dec. 31, 2016T	Jun. 30, 2017aft	Dec. 02, 2014USD ($)
Contingencies And Commitments [Line Items]
Estimated clean up costs | $					$ 342,000
Chiquita Canyon, LLC [Member]
Contingencies And Commitments [Line Items]
Annual tons of waste accepted at landfill			3
Existing waste footprint of landfill | a		257		257
Requested footprint in landfill expansion application | a		400		400
Existing maximum elevation of landfill | ft		1,430		1,430
Requested maximum elevation in landfill expansion application | ft		1,573		1,573
Duration of permitting and environmental impact review for conditional use permit to authorize continued operation and expansion of landfill				12 years 6 months
Recommended condition for approval of conditional use permit, increase in taxes and fees percentage		587.00%
Date application for expansion of landfill and extension of conditional use permit was accepted	Apr. 19, 2017
Duration of extension of conditional use permit extension	30 years
Environmental Remediation Expense [Member]
Contingencies And Commitments [Line Items]
Estimated period to implement cleanup remedy		7 years
Required period of monitoring following the clean-up		10 years
Minimum [Member] | Chiquita Canyon, LLC [Member]
Contingencies And Commitments [Line Items]
Company requested increase in fees paid for approval of conditional use permit	50.00%
Maximum [Member] | Chiquita Canyon, LLC [Member]
Contingencies And Commitments [Line Items]
Company requested increase in fees paid for approval of conditional use permit	100.00%
Recommended condition for approval of conditional use permit, annual limit on tonnage the landfill can accept		2
Current annual limit of overall tonnage at landfill		3
Company requested annual limit on tonnage the landfill can accept	3

Subsequent Events (Details)

Subsequent Events (Details) - $ / shares	Jul. 25, 2017	Jul. 19, 2016
Subsequent Event [Line Items]
Period for share repurchase program		1 year
Share repurchase plan expiration date		Aug. 7, 2017
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends, declared date	Jul. 25, 2017
Dividends per share amount	$ 0.12
Dividends, date to be paid	Aug. 22, 2017
Dividends, date of record	Aug. 8, 2017