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GOODWILL AND INTANGIBLE ASSETS (Tables) | 9 Months Ended
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Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Activity and Balances Related to Goodwill by Operating Segment | A summary of the activity and balances related to goodwill by operating segment follows:
| December 31, 2016 |  | Acquisitions |  | September 30, 2017
Eastern region | $ | 17,429 |  |  | $ | 1,764 |  |  | $ | 19,193 |
Western region | 88,426 |  |  | 422 |  |  | 88,848 |
Recycling | 12,315 |  |  | — |  |  | 12,315 |
Other | 1,729 |  |  | — |  |  | 1,729 |
Total | $ | 119,899 |  |  | $ | 2,186 |  |  | $ | 122,085 |
Summary of Intangible Assets by Intangible Asset Type | A summary of intangible assets by intangible asset type follows:
| Covenants Not-to-Compete |  | Client Lists |  | Total
Balance, September 30, 2017 |  |  |  |  |
Intangible assets | $ | 17,975 |  |  | $ | 17,508 |  |  | $ | 35,483 |
Less accumulated amortization | (16,739 | ) |  | (10,748 | ) |  | (27,487 | )
| $ | 1,236 |  |  | $ | 6,760 |  |  | $ | 7,996 |
| Covenants Not-to-Compete |  | Client Lists |  | Total
Balance, December 31, 2016 |  |  |  |  |
Intangible assets | $ | 17,594 |  |  | $ | 16,071 |  |  | $ | 33,665 |
Less accumulated amortization | (16,402 | ) |  | (9,567 | ) |  | (25,969 | )
| $ | 1,192 |  |  | $ | 6,504 |  |  | $ | 7,696 |
Summary of Intangible Amortization Expense Estimated | A summary of intangible amortization expense estimated for the five fiscal years following the fiscal year ended December 31, 2016 and thereafter follows:
Estimated Future Amortization Expense as of September 30, 2017 |
Fiscal year ending December 31, 2017 | $ | 535 |
Fiscal year ending December 31, 2018 | $ | 1,961 |
Fiscal year ending December 31, 2019 | $ | 1,595 |
Fiscal year ending December 31, 2020 | $ | 1,392 |
Fiscal year ending December 31, 2021 | $ | 1,127 |
Thereafter | $ | 1,386 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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