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SEGMENT REPORTING - Summary of Financial Information by Reportable Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Revenues $ 1,557,283 $ 1,264,542 $ 1,085,089
Cost of operations 1,027,336 832,038 723,117
General and administration 190,754 155,847 133,419
Depreciation and amortization 234,907 170,705 126,351
Expense from acquisition activities 24,879 15,038 4,613
Legal settlement 0 6,150 0
Landfill capping (recovery) charge - veneer failure (1,739) 3,870 0
Southbridge Landfill closure charge 8,385 467 1,436
Environmental remediation charge 0 0 759
Operating income 72,761 80,427 95,394
Interest expense (income), net 51,983 36,837 23,013
Other income, net (270) 6,545 (2,585)
Income before income taxes 21,048 37,045 74,966
Capital expenditures 203,227 154,907 130,960
Total assets 3,230,068 2,535,470 1,449,215
Solid Waste Operations      
Segment Reporting Information [Line Items]      
Revenues 1,227,416 971,743 785,211
Solid Waste Operations | Eastern      
Segment Reporting Information [Line Items]      
Revenues 416,678 374,463 340,058
Solid Waste Operations | Western      
Segment Reporting Information [Line Items]      
Revenues 591,214 511,640 445,153
Solid Waste Operations | Mid-Atlantic      
Segment Reporting Information [Line Items]      
Revenues 219,524 85,640 0
Resource Solutions      
Segment Reporting Information [Line Items]      
Revenues 329,867 292,799 299,878
Inter-company revenue      
Segment Reporting Information [Line Items]      
Revenues (328,949) (281,736) (239,951)
Cost of operations (328,949) (281,736) (239,951)
Inter-company revenue | Solid Waste Operations      
Segment Reporting Information [Line Items]      
Revenues 315,881 266,399 234,217
Inter-company revenue | Solid Waste Operations | Eastern      
Segment Reporting Information [Line Items]      
Revenues 104,529 92,938 83,201
Inter-company revenue | Solid Waste Operations | Western      
Segment Reporting Information [Line Items]      
Revenues 208,963 173,044 151,016
Inter-company revenue | Solid Waste Operations | Mid-Atlantic      
Segment Reporting Information [Line Items]      
Revenues 2,389 417 0
Inter-company revenue | Resource Solutions      
Segment Reporting Information [Line Items]      
Revenues 13,068 15,337 5,734
Operating Segments | Solid Waste Operations      
Segment Reporting Information [Line Items]      
Revenues 1,543,297 1,238,142 1,019,428
Cost of operations 1,078,939 854,471 712,262
General and administration 71,425 60,894 49,956
Depreciation and amortization 212,959 153,435 111,789
Expense from acquisition activities 18,548 9,065 3,233
Legal settlement   6,150  
Landfill capping (recovery) charge - veneer failure (1,739) 3,870  
Southbridge Landfill closure charge 8,385 467 1,436
Environmental remediation charge     759
Operating income 154,780 149,790 139,993
Interest expense (income), net 1,126 1,018 1,073
Capital expenditures 167,590 131,794 103,691
Total assets 2,519,249 1,988,752 1,110,553
Operating Segments | Solid Waste Operations | Eastern      
Segment Reporting Information [Line Items]      
Revenues 521,207 467,401 423,259
Cost of operations 372,123 335,896 312,446
General and administration 24,101 24,416 21,851
Depreciation and amortization 56,760 50,881 47,673
Expense from acquisition activities 384 352 898
Legal settlement   2,614  
Landfill capping (recovery) charge - veneer failure 0 0  
Southbridge Landfill closure charge 8,385 467 1,436
Environmental remediation charge     0
Operating income 59,454 52,775 38,955
Interest expense (income), net 763 638 565
Capital expenditures 44,388 43,817 38,501
Total assets 444,295 434,323 372,895
Operating Segments | Solid Waste Operations | Western      
Segment Reporting Information [Line Items]      
Revenues 800,177 684,684 596,169
Cost of operations 545,823 458,281 399,816
General and administration 33,852 31,672 28,105
Depreciation and amortization 105,563 82,291 64,116
Expense from acquisition activities 3,349 3,421 2,335
Legal settlement   3,536  
Landfill capping (recovery) charge - veneer failure (1,739) 3,870  
Southbridge Landfill closure charge 0 0 0
Environmental remediation charge     759
Operating income 113,329 101,613 101,038
Interest expense (income), net 369 380 508
Capital expenditures 100,329 82,706 65,190
Total assets 1,233,688 1,001,090 737,658
Operating Segments | Solid Waste Operations | Mid-Atlantic      
Segment Reporting Information [Line Items]      
Revenues 221,913 86,057 0
Cost of operations 160,993 60,294 0
General and administration 13,472 4,806 0
Depreciation and amortization 50,636 20,263 0
Expense from acquisition activities 14,815 5,292 0
Legal settlement   0  
Landfill capping (recovery) charge - veneer failure 0 0  
Southbridge Landfill closure charge 0 0 0
Environmental remediation charge     0
Operating income (18,003) (4,598) 0
Interest expense (income), net (6) 0 0
Capital expenditures 22,873 5,271 0
Total assets 841,266 553,339 0
Operating Segments | Resource Solutions      
Segment Reporting Information [Line Items]      
Revenues 342,935 308,136 305,612
Cost of operations 276,582 259,273 250,775
General and administration 19,574 18,149 16,460
Depreciation and amortization 18,254 14,202 12,082
Expense from acquisition activities 105 102 564
Legal settlement   0  
Landfill capping (recovery) charge - veneer failure 0 0  
Southbridge Landfill closure charge 0 0 0
Environmental remediation charge     0
Operating income 28,420 16,410 25,731
Interest expense (income), net 117 143 146
Capital expenditures 25,932 14,586 15,172
Total assets 256,188 253,090 191,118
Corporate Entities      
Segment Reporting Information [Line Items]      
Cost of operations 764 30 31
General and administration 99,755 76,804 67,003
Depreciation and amortization 3,694 3,068 2,480
Expense from acquisition activities 6,226 5,871 816
Legal settlement   0  
Landfill capping (recovery) charge - veneer failure 0 0  
Southbridge Landfill closure charge 0 0 0
Environmental remediation charge     0
Operating income (110,439) (85,773) (70,330)
Interest expense (income), net 50,740 35,676 21,794
Capital expenditures 9,705 8,527 12,097
Total assets $ 454,631 $ 293,628 $ 147,544