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Segment Reporting - Revenues and Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization for Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 956,167 | $ 926,019 | $ 2,798,111 | $ 2,803,728
Total segment gross profit | 317,934 | 297,940 | 909,809 | 911,866
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 956,167 | 926,019 | 2,798,111 | 2,803,728
Compensation expenses | 560,661 | 543,556 | 1,654,060 | 1,639,263
Other segment items | 77,572 | 84,523 | 234,242 | 252,599
Direct costs | 638,233 | 628,079 | 1,888,302 | 1,891,862
Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 5,000 | 4,300 | 12,900 | 12,000
Corporate Finance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total segment gross profit | 151,593 | 109,554 | 396,754 | 353,776
Corporate Finance | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 404,896 | 341,512 | 1,127,780 | 1,055,493
Compensation expenses | 229,204 | 210,774 | 664,564 | 635,587
Other segment items | 24,099 | 21,184 | 66,462 | 66,130
Direct costs | 253,303 | 231,958 | 731,026 | 701,717
FLC |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total segment gross profit | 74,415 | 55,278 | 212,813 | 168,530
FLC | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 194,689 | 168,778 | 571,808 | 514,348
Compensation expenses | 114,996 | 105,584 | 340,359 | 321,896
Other segment items | 5,278 | 7,916 | 18,636 | 23,922
Direct costs | 120,274 | 113,500 | 358,995 | 345,818
Economic Consulting |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total segment gross profit | 25,889 | 63,840 | 109,119 | 180,782
Economic Consulting | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 173,086 | 222,033 | 544,604 | 657,454
Compensation expenses | 131,804 | 143,096 | 395,813 | 431,270
Other segment items | 15,393 | 15,097 | 39,672 | 45,402
Direct costs | 147,197 | 158,193 | 435,485 | 476,672
Technology |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total segment gross profit | 31,919 | 38,827 | 89,552 | 118,896
Technology | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 94,081 | 110,404 | 274,836 | 326,992
Compensation expenses | 37,242 | 38,691 | 110,892 | 114,267
Other segment items | 24,920 | 32,886 | 74,392 | 93,829
Direct costs | 62,162 | 71,577 | 185,284 | 208,096
Strategic Communications |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total segment gross profit | 34,118 | 30,441 | 101,571 | 89,882
Strategic Communications | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 89,415 | 83,292 | 279,083 | 249,441
Compensation expenses | 47,415 | 45,411 | 142,432 | 136,243
Other segment items | 7,882 | 7,440 | 35,080 | 23,316
Direct costs | $ 55,297 | $ 52,851 | $ 177,512 | $ 159,559

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