Basis of Presentation and Summary	9 Months Ended
Sep. 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 nine month periods ended September 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.

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 nine month periods ended September 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.