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BUSINESS COMBINATIONS - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Oct. 04, 2021
Business Acquisition [Line Items] |  |  |
Goodwill | $ 1,087,784 | $ 1,070,442 |
GCA Corporation |  |  |
Business Acquisition [Line Items] |  |  |
Cash and cash equivalents | 228,877 |  |
Investment securities | 515 |  |
Accounts receivable | 56,080 |  |
Unbilled work in progress | 4,672 |  |
Deferred income taxes | 1,876 |  |
Property and equipment | 8,727 |  |
Operating lease right-of-use assets | 27,383 |  |
Other assets | 20,506 |  |
Total intangible assets acquired | 74,300 |  |
Total assets | 422,936 |  |
Accrued salaries and bonuses | 152,409 |  |
Accounts payable and accrued expenses | 22,722 |  |
Payable to affiliates | 15 |  |
Deferred income | 78 |  |
Deferred income taxes | 0 |  |
Income taxes payable | 2,290 |  |
Operating lease liabilities | 27,527 |  |
Other liabilities | 22,647 |  |
Total liabilities | 227,688 |  |
Net identifiable assets acquired | 195,248 |  |
Goodwill | 394,321 |  | $ 394,300
Total GCA equity value | $ 589,569 |  |
Weighted-Average Amortization Period | 1 year 3 months 18 days |  |
GCA Corporation | Backlog |  |  |
Business Acquisition [Line Items] |  |  |
Total intangible assets acquired | $ 42,000 |  |
Weighted-Average Amortization Period | 1 year 2 months 12 days |  |
GCA Corporation | Trade name |  |  |
Business Acquisition [Line Items] |  |  |
Total intangible assets acquired | $ 17,100 |  |
Weighted-Average Amortization Period | 2 years |  |
GCA Corporation | Customer relationships |  |  |
Business Acquisition [Line Items] |  |  |
Total intangible assets acquired | $ 15,200 |  |
Weighted-Average Amortization Period | 1 year |  |

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