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SEGMENT REPORTING - Summary of Financial Information by Reportable Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Gross revenues $ 485,351 $ 411,627 $ 1,367,786 $ 1,129,797  
Cost of operations 315,262 267,117 903,783 741,695  
General and administration 57,273 47,030 168,282 138,547  
Depreciation and amortization 78,829 59,174 227,326 168,549  
Southbridge Landfill closure charge   8,477   8,477  
Expense (income) from acquisition activities 4,618 5,450 16,610 18,297  
Operating income 29,369 24,379 51,785 54,232  
Interest expense, net 13,915 14,368 38,513 40,134  
Other income (436) (412) (1,370) (1,239)  
Income before income taxes 15,890 10,423 14,642 15,337  
Capital expenditures 65,925 51,461 187,803 126,361  
Total assets 3,285,292 3,123,229 3,285,292 3,123,229 $ 3,230,068
Solid waste          
Segment Reporting Information [Line Items]          
Gross revenues 392,170 325,165 1,100,698 885,046  
Solid waste | Eastern          
Segment Reporting Information [Line Items]          
Gross revenues 125,975 117,543 351,639 331,266  
Solid waste | Western          
Segment Reporting Information [Line Items]          
Gross revenues 175,124 142,903 497,575 403,859  
Solid waste | Mid-Atlantic          
Segment Reporting Information [Line Items]          
Gross revenues 91,071 64,719 251,484 149,921  
Resource Solutions          
Segment Reporting Information [Line Items]          
Gross revenues 93,181 86,462 267,088 244,751  
Inter-company revenue          
Segment Reporting Information [Line Items]          
Gross revenues (104,644) (86,362) (283,440) (241,666)  
Cost of operations (104,644) (86,362) (283,440) (241,666)  
Inter-company revenue | Solid waste          
Segment Reporting Information [Line Items]          
Gross revenues 99,247 83,381 270,437 232,726  
Inter-company revenue | Solid waste | Eastern          
Segment Reporting Information [Line Items]          
Gross revenues 31,628 30,559 86,786 83,169  
Inter-company revenue | Solid waste | Western          
Segment Reporting Information [Line Items]          
Gross revenues 62,311 51,627 173,085 147,198  
Inter-company revenue | Solid waste | Mid-Atlantic          
Segment Reporting Information [Line Items]          
Gross revenues 5,308 1,195 10,566 2,359  
Inter-company revenue | Resource Solutions          
Segment Reporting Information [Line Items]          
Gross revenues 5,397 2,981 13,003 8,940  
Operating Segments | Solid waste          
Segment Reporting Information [Line Items]          
Gross revenues 491,417 408,546 1,371,135 1,117,772  
Cost of operations 340,642 280,985 960,739 777,157  
General and administration 20,224 18,561 59,899 51,504  
Depreciation and amortization 71,913 53,765 206,653 151,849  
Southbridge Landfill closure charge   8,477   8,477  
Expense (income) from acquisition activities 3,953 5,063 11,242 15,037  
Operating income 54,685 41,695 132,602 113,748  
Interest expense, net 671 304 1,744 1,073  
Capital expenditures 59,593 40,943 169,245 101,726  
Total assets 2,736,050 2,281,903 2,736,050 2,281,903  
Operating Segments | Solid waste | Eastern          
Segment Reporting Information [Line Items]          
Gross revenues 157,603 148,102 438,425 414,435  
Cost of operations 109,930 103,872 311,813 296,966  
General and administration 6,410 6,034 18,180 18,768  
Depreciation and amortization 18,273 15,387 52,198 44,784  
Southbridge Landfill closure charge   8,477   8,477  
Expense (income) from acquisition activities 119 (15) 679 230  
Operating income 22,871 14,347 55,555 45,210  
Interest expense, net 372 215 904 633  
Capital expenditures 19,118 15,786 46,041 32,260  
Total assets 561,914 480,472 561,914 480,472  
Operating Segments | Solid waste | Western          
Segment Reporting Information [Line Items]          
Gross revenues 237,435 194,530 670,660 551,057  
Cost of operations 158,794 129,064 452,290 370,981  
General and administration 8,625 8,336 26,802 24,285  
Depreciation and amortization 34,269 24,175 97,389 71,746  
Southbridge Landfill closure charge   0   0  
Expense (income) from acquisition activities 668 1,837 2,121 2,499  
Operating income 35,079 31,118 92,058 81,546  
Interest expense, net 246 137 687 494  
Capital expenditures 21,661 18,675 61,106 52,403  
Total assets 1,137,202 928,744 1,137,202 928,744  
Operating Segments | Solid waste | Mid-Atlantic          
Segment Reporting Information [Line Items]          
Gross revenues 96,379 65,914 262,050 152,280  
Cost of operations 71,918 48,049 196,636 109,210  
General and administration 5,189 4,191 14,917 8,451  
Depreciation and amortization 19,371 14,203 57,066 35,319  
Southbridge Landfill closure charge   0   0  
Expense (income) from acquisition activities 3,166 3,241 8,442 12,308  
Operating income (3,265) (3,770) (15,011) (13,008)  
Interest expense, net 53 (48) 153 (54)  
Capital expenditures 18,814 6,482 62,098 17,063  
Total assets 1,036,934 872,687 1,036,934 872,687  
Operating Segments | Resource Solutions          
Segment Reporting Information [Line Items]          
Gross revenues 98,578 89,443 280,091 253,691  
Cost of operations 78,636 71,216 224,956 204,511  
General and administration 5,885 5,084 16,002 14,605  
Depreciation and amortization 5,333 4,472 15,825 13,806  
Southbridge Landfill closure charge   0   0  
Expense (income) from acquisition activities (1,319) 19 (295) 80  
Operating income 10,043 8,652 23,603 20,689  
Interest expense, net 23 27 76 91  
Capital expenditures 3,470 7,899 9,889 17,966  
Total assets 285,918 255,160 285,918 255,160  
Corporate Entities          
Segment Reporting Information [Line Items]          
Cost of operations 628 1,278 1,528 1,693  
General and administration 31,164 23,385 92,381 72,438  
Depreciation and amortization 1,583 937 4,848 2,894  
Southbridge Landfill closure charge   0   0  
Expense (income) from acquisition activities 1,984 368 5,663 3,180  
Operating income (35,359) (25,968) (104,420) (80,205)  
Interest expense, net 13,221 14,037 36,693 38,970  
Capital expenditures 2,862 2,619 8,669 6,669  
Total assets $ 263,324 $ 586,166 $ 263,324 $ 586,166