GOODWILL AND INTANGIBLE ASSETS - Schedule of Identifiable Assets (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Intangible Asset, Acquired, Finite-Lived [Line Items] | ||
| Gross Carrying Amount | $ 579,605 | $ 572,282 |
| Accumulated Amortization | (339,845) | (249,214) |
| Net Carrying Amount | 239,760 | 323,068 |
| Contract backlogs and recompetes | ||
| Intangible Asset, Acquired, Finite-Lived [Line Items] | ||
| Gross Carrying Amount | 395,800 | 393,300 |
| Accumulated Amortization | (287,235) | (210,084) |
| Net Carrying Amount | 108,565 | 183,216 |
| Customer contracts | ||
| Intangible Asset, Acquired, Finite-Lived [Line Items] | ||
| Gross Carrying Amount | 182,705 | 177,722 |
| Accumulated Amortization | (51,510) | (37,870) |
| Net Carrying Amount | 131,195 | 139,852 |
| Trade names and other | ||
| Intangible Asset, Acquired, Finite-Lived [Line Items] | ||
| Gross Carrying Amount | 1,100 | 1,260 |
| Accumulated Amortization | (1,100) | (1,260) |
| Net Carrying Amount | $ 0 | $ 0 |