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SEGMENT REPORTING - Summary of Financial Information by Reportable Segment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Revenues $ 889,211 $ 774,584 $ 743,290
Depreciation and amortization 103,590 90,782 79,790
Operating income (loss) 77,660 59,297 53,075
Interest expense, net 20,927 22,068 24,735
Capital expenditures 123,295 108,108 103,165
Goodwill 232,860 194,901 185,819
Total assets 1,283,580 1,193,898 932,182
Eastern      
Segment Reporting Information [Line Items]      
Goodwill 52,072 30,873 30,720
Western      
Segment Reporting Information [Line Items]      
Goodwill 163,728 149,984 141,055
Resource Solutions      
Segment Reporting Information [Line Items]      
Goodwill 17,060 14,044 14,044
Operating Segments | Eastern      
Segment Reporting Information [Line Items]      
Revenues 264,569 220,285 219,475
Depreciation and amortization 33,572 25,669 24,322
Operating income (loss) 12,937 11,635 9,503
Interest expense, net 456 275 218
Capital expenditures 31,489 29,292 24,499
Goodwill 52,072 30,873 30,720
Total assets 357,446 223,492 207,060
Operating Segments | Western      
Segment Reporting Information [Line Items]      
Revenues 389,520 357,989 345,212
Depreciation and amortization 61,055 56,457 47,650
Operating income (loss) 49,035 42,688 42,019
Interest expense, net 159 141 63
Capital expenditures 72,892 71,989 63,547
Goodwill 163,728 149,984 141,055
Total assets 688,826 642,003 599,047
Operating Segments | Resource Solutions      
Segment Reporting Information [Line Items]      
Revenues 235,122 196,310 178,603
Depreciation and amortization 7,060 6,279 5,342
Operating income (loss) 17,591 7,357 5,807
Interest expense, net 168 201 156
Capital expenditures 12,094 2,477 12,475
Goodwill 17,060 14,044 14,044
Total assets 127,304 88,512 90,660
Inter-company revenue      
Segment Reporting Information [Line Items]      
Revenues (202,298) (180,435) (163,920)
Inter-company revenue | Eastern      
Segment Reporting Information [Line Items]      
Revenues (66,126) (53,102) (54,738)
Inter-company revenue | Western      
Segment Reporting Information [Line Items]      
Revenues (132,914) (116,658) (98,420)
Inter-company revenue | Resource Solutions      
Segment Reporting Information [Line Items]      
Revenues (3,258) (10,675) (10,762)
Corporate Entities      
Segment Reporting Information [Line Items]      
Revenues 0 0 0
Depreciation and amortization 1,903 2,377 2,476
Operating income (loss) (1,903) (2,383) (4,254)
Interest expense, net 20,144 21,451 24,298
Capital expenditures 6,820 4,350 2,644
Goodwill 0 0 0
Total assets $ 110,004 $ 239,891 $ 35,415