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LONG-TERM DEBT - Summary of Components of Long-Term Debt and Capital Leases by Debt Instrument (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Debt Instrument [Line Items] |  |
Long-term debt and capital lease | $ 500,302 | $ 525,583
Less—unamortized discount and debt issuance costs | 15,864 | 16,936
Long-term debt and capital leases less unamortized discount and debt issuance costs | 484,438 | 508,647
Less—current maturities of long-term debt | 6,014 | 4,686
Non current portion of long term debt and capital lease obligation | 478,424 | 503,961
Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Long-term debt and capital lease | 36,300 | 62,600
Less—unamortized discount and debt issuance costs | 4,195 | 4,965
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014 due December 2044 - fixed rate interest period through 2019; bearing interest at 3.75% |  |
Debt Instrument [Line Items] |  |
Long-term debt and capital lease | 25,000 | 25,000
Less—unamortized discount and debt issuance costs | 1,081 | 1,221
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-2 due December 2044 - fixed rate interest period through 2026; bearing interest at 3.125% |  |
Debt Instrument [Line Items] |  |
Long-term debt and capital lease | 15,000 | 15,000
Less—unamortized discount and debt issuance costs | 526 | 571
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3 due January 2025 - fixed rate interest period through 2025; bearing interest at 5.25% |  |
Debt Instrument [Line Items] |  |
Long-term debt and capital lease | 25,000 | 0
Less—unamortized discount and debt issuance costs | 623 | 0
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015 due August 2035 - fixed rate interest period through 2025; bearing interest at 5.125% |  |
Debt Instrument [Line Items] |  |
Long-term debt and capital lease | 15,000 | 15,000
Less—unamortized discount and debt issuance costs | 708 | 760
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 due April 2036 - fixed rate interest period through 2018; bearing interest at 4.75% |  |
Debt Instrument [Line Items] |  |
Long-term debt and capital lease | 16,000 | 16,000
Less—unamortized discount and debt issuance costs | 581 | 605
Business Finance Authority of the State of New Hampshire Solid Waste Disposal Revenue Bonds Series 2013 due April 2029 - fixed rate interest period through 2019; bearing interest at 4.00% |  |
Debt Instrument [Line Items] |  |
Long-term debt and capital lease | 11,000 | 11,000
Less—unamortized discount and debt issuance costs | 468 | 563
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-2 due January 2025 - fixed rate interest period through 2017; bore interest at 6.25% |  |
Debt Instrument [Line Items] |  |
Long-term debt and capital lease | 0 | 21,400
Less—unamortized discount and debt issuance costs | 0 | 502
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-1; letter of credit backed due January 2025 - bore interest at SIFMA Index |  |
Debt Instrument [Line Items] |  |
Long-term debt and capital lease | 0 | 3,600
Less—unamortized discount and debt issuance costs | 0 | 31
Capital leases maturing through September 2023; bearing interest at up to 7.70% |  |
Debt Instrument [Line Items] |  |
Long-term debt and capital lease | 5,870 | 5,534
Notes payable maturing through June 2027; bearing interest at up to 7.00% |  |
Debt Instrument [Line Items] |  |
Long-term debt and capital lease | 2,882 | 449
Term Loan B Facility due October 2023; bearing interest at LIBOR plus 2.75% and 3.00%, respectively | Secured Debt |  |
Debt Instrument [Line Items] |  |
Long-term debt and capital lease | 348,250 | 350,000
Less—unamortized discount and debt issuance costs | 7,682 | 7,718
Unamortized discount | $ 1,540 | $ 1,712

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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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