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SEGMENT REPORTING - Summary of Financial Information by Reportable Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]          
Revenues $ 188,767 $ 187,459 $ 371,676 $ 351,123  
Depreciation and amortization 22,076 19,715 43,482 37,204  
Operating Income (Loss) 17,444 15,544 24,456 19,986  
Total assets 966,971   966,971   $ 932,182
Operating          
Segment Reporting Information [Line Items]          
Revenues 188,767 187,459 371,676 351,123  
Depreciation and amortization 22,076 19,715 43,482 37,204  
Operating Income (Loss) 17,444 15,544 24,456 19,986  
Total assets 966,971 865,960 966,971 865,960  
Operating | Eastern          
Segment Reporting Information [Line Items]          
Revenues 53,336 57,076 103,479 104,073  
Depreciation and amortization 6,339 6,368 12,297 11,629  
Operating Income (Loss) 4,366 4,227 5,341 3,600  
Total assets 211,441 211,891 211,441 211,891  
Operating | Western          
Segment Reporting Information [Line Items]          
Revenues 87,286 85,748 172,491 159,899  
Depreciation and amortization 13,615 11,413 26,847 21,647  
Operating Income (Loss) 11,863 10,372 17,505 15,749  
Total assets 626,329 531,027 626,329 531,027  
Operating | Resource Solutions          
Segment Reporting Information [Line Items]          
Revenues 48,145 44,635 95,706 87,151  
Depreciation and amortization 1,538 1,303 3,148 2,597  
Operating Income (Loss) 1,801 1,604 2,804 2,005  
Total assets 91,907 88,181 91,907 88,181  
Operating | Corporate entities          
Segment Reporting Information [Line Items]          
Revenues 0 0 0 0  
Depreciation and amortization 584 631 1,190 1,331  
Operating Income (Loss) (586) (659) (1,194) (1,368)  
Total assets 37,294 34,861 37,294 34,861  
Inter-company revenues          
Segment Reporting Information [Line Items]          
Revenues (45,305) (41,914) (85,583) (75,290)  
Inter-company revenues | Eastern          
Segment Reporting Information [Line Items]          
Revenues 13,837 14,678 25,676 25,449  
Inter-company revenues | Western          
Segment Reporting Information [Line Items]          
Revenues 29,020 24,496 54,566 44,714  
Inter-company revenues | Resource Solutions          
Segment Reporting Information [Line Items]          
Revenues 2,448 2,740 5,341 5,127  
Inter-company revenues | Corporate entities          
Segment Reporting Information [Line Items]          
Revenues $ 0 $ 0 $ 0 $ 0