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SEGMENT REPORTING - Summary of Financial Information by Reportable Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]          
Revenues $ 241,969 $ 202,667 $ 647,375 $ 574,344  
Depreciation and amortization 27,491 23,799 74,510 67,281  
Operating income (loss) 27,387 20,633 61,343 45,089  
Total assets 1,280,397 994,255 1,280,397 994,255 $ 1,193,898
Operating | Eastern          
Segment Reporting Information [Line Items]          
Revenues 75,154 58,323 188,557 161,803  
Depreciation and amortization 9,407 6,659 23,342 18,956  
Operating income (loss) 5,374 3,683 11,401 9,023  
Total assets 352,067 215,639 352,067 215,639  
Operating | Western          
Segment Reporting Information [Line Items]          
Revenues 103,523 94,728 288,139 267,218  
Depreciation and amortization 15,710 15,000 44,838 41,847  
Operating income (loss) 15,805 15,344 38,462 32,849  
Total assets 673,608 635,153 673,608 635,153  
Operating | Resource solutions          
Segment Reporting Information [Line Items]          
Revenues 63,292 49,616 170,679 145,323  
Depreciation and amortization 1,903 1,544 5,020 4,692  
Operating income (loss) 6,679 2,204 12,792 5,008  
Total assets 126,529 89,870 126,529 89,870  
Corporate entities          
Segment Reporting Information [Line Items]          
Revenues 0 0 0 0  
Depreciation and amortization 471 596 1,310 1,786  
Operating income (loss) (471) (598) (1,312) (1,791)  
Total assets 128,193 53,593 128,193 53,593  
Inter-company revenues          
Segment Reporting Information [Line Items]          
Revenues (54,447) (48,759) (148,430) (134,342)  
Inter-company revenues | Eastern          
Segment Reporting Information [Line Items]          
Revenues (18,768) (14,261) (47,322) (39,936)  
Inter-company revenues | Western          
Segment Reporting Information [Line Items]          
Revenues (35,523) (31,692) (97,771) (86,259)  
Inter-company revenues | Resource solutions          
Segment Reporting Information [Line Items]          
Revenues $ (156) $ (2,806) $ (3,337) $ (8,147)