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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