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SEGMENT REPORTING - Summary of Financial Information by Reportable Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 174,724 | $ 172,832 | $ 165,649 | $ 147,455 | $ 151,222 | $ 160,269 | $ 154,016 | $ 133,802 | $ 660,660 | $ 599,309 | $ 565,030
Depreciation and amortization |  |  |  |  |  |  |  |  | 70,508 | 62,102 | 61,856
Operating income (loss) | (5,138) | $ 28,884 | $ 15,149 | $ 838 | 9,855 | $ 18,277 | $ (47,279) | $ 6,564 | 39,733 | (12,583) | 44,945
Goodwill | 162,734 |  |  |  | 122,605 |  |  |  | 162,734 | 122,605 | 119,899
Total assets | 732,410 |  |  |  | 614,949 |  |  |  | 732,410 | 614,949 |
Eastern |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill | 28,154 |  |  |  | 19,192 |  |  |  | 28,154 | 19,192 | 17,429
Western |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill | 120,536 |  |  |  | 89,369 |  |  |  | 120,536 | 89,369 | 88,426
Recycling |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill | 12,315 |  |  |  | 12,315 |  |  |  | 12,315 | 12,315 | 12,315
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill | 1,729 |  |  |  | 1,729 |  |  |  | 1,729 | 1,729 | 1,729
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 660,660 | 599,309 | 565,030
Depreciation and amortization |  |  |  |  |  |  |  |  | 70,508 | 62,102 | 61,856
Operating income (loss) |  |  |  |  |  |  |  |  | 39,733 | (12,583) | 44,945
Interest expense, net |  |  |  |  |  |  |  |  | 26,021 | 24,887 | 38,652
Capital expenditures |  |  |  |  |  |  |  |  | 73,232 | 64,862 | 54,238
Goodwill | 162,734 |  |  |  | 122,605 |  |  |  | 162,734 | 122,605 | 119,899
Total assets | 732,410 |  |  |  | 614,949 |  |  |  | 732,410 | 614,949 | 631,512
Operating Segments | Eastern |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 206,473 | 181,170 | 176,539
Depreciation and amortization |  |  |  |  |  |  |  |  | 26,538 | 23,815 | 27,036
Operating income (loss) |  |  |  |  |  |  |  |  | 4,684 | (51,867) | 9,697
Interest expense, net |  |  |  |  |  |  |  |  | 12 | 3 | (16)
Capital expenditures |  |  |  |  |  |  |  |  | 23,393 | 17,153 | 18,363
Goodwill | 28,154 |  |  |  | 19,192 |  |  |  | 28,154 | 19,192 | 17,429
Total assets | 184,679 |  |  |  | 157,248 |  |  |  | 184,679 | 157,248 | 202,420
Operating Segments | Western |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 286,262 | 250,771 | 233,168
Depreciation and amortization |  |  |  |  |  |  |  |  | 35,843 | 30,766 | 27,511
Operating income (loss) |  |  |  |  |  |  |  |  | 41,529 | 35,035 | 30,576
Interest expense, net |  |  |  |  |  |  |  |  | (148) | (220) | (248)
Capital expenditures |  |  |  |  |  |  |  |  | 41,850 | 42,082 | 31,637
Goodwill | 120,536 |  |  |  | 89,369 |  |  |  | 120,536 | 89,369 | 88,426
Total assets | 428,934 |  |  |  | 344,324 |  |  |  | 428,934 | 344,324 | 327,628
Operating Segments | Recycling |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 42,191 | 62,307 | 52,911
Depreciation and amortization |  |  |  |  |  |  |  |  | 4,345 | 4,125 | 4,212
Operating income (loss) |  |  |  |  |  |  |  |  | (7,805) | 2,805 | 2,542
Interest expense, net |  |  |  |  |  |  |  |  | 140 | 143 | 156
Capital expenditures |  |  |  |  |  |  |  |  | 4,476 | 2,006 | 2,218
Goodwill | 12,315 |  |  |  | 12,315 |  |  |  | 12,315 | 12,315 | 12,315
Total assets | 48,629 |  |  |  | 48,612 |  |  |  | 48,629 | 48,612 | 49,931
Operating Segments | Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 125,734 | 105,061 | 102,412
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,782 | 3,396 | 3,097
Operating income (loss) |  |  |  |  |  |  |  |  | 1,325 | 1,444 | 2,130
Interest expense, net |  |  |  |  |  |  |  |  | 26,017 | 24,961 | 38,760
Capital expenditures |  |  |  |  |  |  |  |  | 3,513 | 3,621 | 2,020
Goodwill | 1,729 |  |  |  | 1,729 |  |  |  | 1,729 | 1,729 | 1,729
Total assets | $ 70,168 |  |  |  | $ 64,765 |  |  |  | 70,168 | 64,765 | 51,533
Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (142,789) | (123,972) | (116,331)
Eliminations | Eastern |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 52,866 | 50,335 | 45,728
Eliminations | Western |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 81,515 | 71,510 | 67,985
Eliminations | Recycling |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 6,426 | 246 | 1,003
Eliminations | Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 1,982 | $ 1,881 | $ 1,615

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