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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) |

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