v3.26.1
SEGMENT REPORTING - Schedule of Financial Information by Reportable Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Segment Reporting [Line Items]          
Gross revenues $ 543,748 $ 465,334 $ 1,001,076 $ 882,435  
Cost of operations 364,949 308,070 673,874 588,521  
General and administration 63,168 54,523 121,296 111,009  
Depreciation and amortization 88,498 77,006 166,481 148,497  
Expense from acquisition activities 6,081 6,463 12,590 11,992  
Organics facility closure charge 1,088 0 2,016 0  
Operating income 19,964 19,272 24,819 22,416  
Interest expense, net 17,421 13,000 31,414 24,598  
Other income (822) (615) (1,136) (933)  
Income (loss) before income taxes 3,365 6,887 (5,459) (1,249)  
Capital expenditures 72,309 66,403 122,288 121,878  
Total assets 3,557,516 3,256,911 3,557,516 3,256,911 $ 3,303,326
Solid waste          
Segment Reporting [Line Items]          
Gross revenues 442,187 373,624 810,717 708,528  
Solid waste | Eastern          
Segment Reporting [Line Items]          
Gross revenues 154,218 120,924 265,506 225,664  
Solid waste | Western          
Segment Reporting [Line Items]          
Gross revenues 185,738 170,134 348,186 322,451  
Solid waste | Mid-Atlantic          
Segment Reporting [Line Items]          
Gross revenues 102,231 82,566 197,025 160,413  
Resource Solutions          
Segment Reporting [Line Items]          
Gross revenues 101,561 91,710 190,359 173,907  
Inter-company revenue          
Segment Reporting [Line Items]          
Gross revenues (120,531) (101,026) (220,373) (186,329)  
Cost of operations (120,531) (101,026) (220,373) (186,329)  
Inter-company revenue | Solid waste          
Segment Reporting [Line Items]          
Gross revenues 114,626 96,896 208,670 178,723  
Inter-company revenue | Solid waste | Eastern          
Segment Reporting [Line Items]          
Gross revenues 37,397 32,404 64,906 58,692  
Inter-company revenue | Solid waste | Western          
Segment Reporting [Line Items]          
Gross revenues 69,910 61,047 129,903 114,773  
Inter-company revenue | Solid waste | Mid-Atlantic          
Segment Reporting [Line Items]          
Gross revenues 7,319 3,445 13,861 5,258  
Inter-company revenue | Resource Solutions          
Segment Reporting [Line Items]          
Gross revenues 5,905 4,130 11,703 7,606  
Operating Segments | Solid waste          
Segment Reporting [Line Items]          
Gross revenues 556,813 470,520 1,019,387 887,251  
Cost of operations 396,631 332,395 725,630 627,631  
General and administration 21,922 20,454 42,869 39,676  
Depreciation and amortization 80,440 70,012 151,204 134,742  
Expense from acquisition activities 2,662 3,635 4,564 7,288  
Organics facility closure charge 0   0    
Operating income 55,158 44,024 95,120 77,914  
Interest expense, net 1,058 571 2,065 1,073  
Capital expenditures 63,232 60,717 107,889 109,653  
Total assets 3,143,623 2,679,574 3,143,623 2,679,574  
Operating Segments | Solid waste | Eastern          
Segment Reporting [Line Items]          
Gross revenues 191,615 153,328 330,412 284,356  
Cost of operations 137,443 109,763 238,345 205,417  
General and administration 8,457 5,718 15,048 11,771  
Depreciation and amortization 24,877 17,816 42,033 33,925  
Expense from acquisition activities 860 165 924 560  
Organics facility closure charge 0   0    
Operating income 19,978 19,866 34,062 32,683  
Interest expense, net 351 306 735 532  
Capital expenditures 17,181 18,820 24,856 26,923  
Total assets 862,117 552,443 862,117 552,443  
Operating Segments | Solid waste | Western          
Segment Reporting [Line Items]          
Gross revenues 255,648 231,181 478,089 437,224  
Cost of operations 174,290 157,086 326,065 297,496  
General and administration 7,806 9,008 16,203 18,177  
Depreciation and amortization 34,248 32,761 66,705 63,121  
Expense from acquisition activities 213 608 335 1,452  
Organics facility closure charge 0   0    
Operating income 39,091 31,718 68,781 56,978  
Interest expense, net 240 220 478 441  
Capital expenditures 30,513 24,245 46,591 39,445  
Total assets 1,129,088 1,147,974 1,129,088 1,147,974  
Operating Segments | Solid waste | Mid-Atlantic          
Segment Reporting [Line Items]          
Gross revenues 109,550 86,011 210,886 165,671  
Cost of operations 84,898 65,546 161,220 124,718  
General and administration 5,659 5,728 11,618 9,728  
Depreciation and amortization 21,315 19,435 42,466 37,696  
Expense from acquisition activities 1,589 2,862 3,305 5,276  
Organics facility closure charge 0   0    
Operating income (3,911) (7,560) (7,723) (11,747)  
Interest expense, net 467 45 852 100  
Capital expenditures 15,538 17,652 36,442 43,285  
Total assets 1,152,418 979,157 1,152,418 979,157  
Operating Segments | Resource Solutions          
Segment Reporting [Line Items]          
Gross revenues 107,466 95,840 202,062 181,513  
Cost of operations 88,252 76,286 167,109 146,319  
General and administration 6,340 5,576 11,791 10,117  
Depreciation and amortization 6,116 5,358 11,312 10,491  
Expense from acquisition activities 471 33 488 1,024  
Organics facility closure charge 1,088   2,016    
Operating income 5,199 8,587 9,346 13,562  
Interest expense, net 21 27 43 53  
Capital expenditures 4,447 2,348 6,163 6,419  
Total assets 312,361 282,951 312,361 282,951  
Corporate Entities          
Segment Reporting [Line Items]          
Gross revenues     0    
Cost of operations 597 415 1,508 900  
General and administration 34,906 28,493 66,636 61,216  
Depreciation and amortization 1,942 1,636 3,965 3,264  
Expense from acquisition activities 2,948 2,795 7,538 3,680  
Organics facility closure charge 0   0    
Operating income (40,393) (33,339) (79,647) (69,060)  
Interest expense, net 16,342 12,402 29,306 23,472  
Capital expenditures 4,630 3,338 8,236 5,806  
Total assets $ 101,532 $ 294,386 $ 101,532 $ 294,386