Subsequent Events	12 Months Ended
Dec. 31, 2016
Subsequent Events [Abstract]
Subsequent Events	18.SUBSEQUENT EVENTS On January 3, 2017, the Company announced that it 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 six collection operations, six transfer stations and two recycling facilities. The Company has not completed the allocation of the acquisition purchase price for Groot of the identifiable assets acquired and liabilities assumed. On February 13, 2017, the Company entered into a First Supplement to Master Note Purchase Agreement with certain accredited institutional investors, pursuant to which the Company expects to issue and sell to the investors on April 20, 2017 $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 may issue additional series of senior unsecured notes pursuant to the terms and conditions of the 2016 NPA, provided that the purchasers of the outstanding notes, including the 2016 Senior Notes and 2017A Senior Notes, shall not have any obligation to purchase any additional notes issued pursuant to the 2016 NPA and the aggregate principal amount of the outstanding notes and any additional notes issued pursuant to the 2016 NPA shall not exceed $1,500,000. Upon the funding of the 2017A Senior Notes, the Company will have $1,150,000 of Notes outstanding under the 2016 NPA. The Company intends to use the proceeds from the sale of the 2017A Senior Notes for general corporate purposes, including funding a portion of the purchase price for the acquisition of Groot described above. On February 21, 2017, the Company announced that its Board of Directors approved a regular quarterly cash dividend of $0.18 per Company common share. The dividend will be paid on March 21, 2017, to shareholders of record on the close of business on March 7, 2017.

18.SUBSEQUENT EVENTS

On January 3, 2017, the Company announced that it 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 six collection operations, six transfer stations and two recycling facilities. The Company has not completed the allocation of the acquisition purchase price for Groot of the identifiable assets acquired and liabilities assumed.

On February 13, 2017, the Company entered into a First Supplement to Master Note Purchase Agreement with certain accredited institutional investors, pursuant to which the Company expects to issue and sell to the investors on April 20, 2017 $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 may issue additional series of senior unsecured notes pursuant to the terms and conditions of the 2016 NPA, provided that the purchasers of the outstanding notes, including the 2016 Senior Notes and 2017A Senior Notes, shall not have any obligation to purchase any additional notes issued pursuant to the 2016 NPA and the aggregate principal amount of the outstanding notes and any additional notes issued pursuant to the 2016 NPA shall not exceed $1,500,000. Upon the funding of the 2017A Senior Notes, the Company will have $1,150,000 of Notes outstanding under the 2016 NPA.

The Company intends to use the proceeds from the sale of the 2017A Senior Notes for general corporate purposes, including funding a portion of the purchase price for the acquisition of Groot described above.

On February 21, 2017, the Company announced that its Board of Directors approved a regular quarterly cash dividend of $0.18 per Company common share. The dividend will be paid on March 21, 2017, to shareholders of record on the close of business on March 7, 2017.