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SEGMENT REPORTING - Summary of Financial Information by Reportable Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Revenues $ 189,532 $ 182,910  
Depreciation and amortization 22,682 21,406  
Operating Income (Loss) 12,009 7,012  
Total assets 1,194,246 957,640 $ 1,193,898
Operating | Eastern      
Segment Reporting Information [Line Items]      
Revenues 52,345 50,143  
Depreciation and amortization 6,622 5,958  
Operating Income (Loss) 2,245 975  
Total assets 221,200 206,334  
Operating | Western      
Segment Reporting Information [Line Items]      
Revenues 85,764 85,206  
Depreciation and amortization 14,039 13,232  
Operating Income (Loss) 7,756 5,642  
Total assets 646,381 599,815  
Operating | Resource Solutions      
Segment Reporting Information [Line Items]      
Revenues 51,423 47,561  
Depreciation and amortization 1,568 1,610  
Operating Income (Loss) 2,462 1,003  
Total assets 88,759 93,199  
Corporate entities      
Segment Reporting Information [Line Items]      
Revenues 0 0  
Depreciation and amortization 453 606  
Operating Income (Loss) (454) (608)  
Total assets 237,906 58,292  
Inter-company revenues      
Segment Reporting Information [Line Items]      
Revenues (43,011) (40,279)  
Inter-company revenues | Eastern      
Segment Reporting Information [Line Items]      
Revenues (12,426) (11,839)  
Inter-company revenues | Western      
Segment Reporting Information [Line Items]      
Revenues (28,682) (25,546)  
Inter-company revenues | Resource Solutions      
Segment Reporting Information [Line Items]      
Revenues $ (1,903) $ (2,894)