Segment Reporting - Schedule of Revenues and Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization for Reportable Segments (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
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| Segment Reporting [Line Items] | ||||
| Revenues | $ 993,464 | $ 943,662 | $ 1,976,809 | $ 1,841,944 |
| Total segment gross profit | 316,273 | 302,521 | 623,100 | 591,875 |
| Operating Segments | ||||
| Segment Reporting [Line Items] | ||||
| Revenues | 993,464 | 943,662 | 1,976,809 | 1,841,944 |
| Compensation expenses | 598,250 | 560,388 | 1,194,992 | 1,093,399 |
| Other segment items | 78,941 | 80,753 | 158,717 | 156,670 |
| Direct costs | 677,191 | 641,141 | 1,353,709 | 1,250,069 |
| Corporate Finance | ||||
| Segment Reporting [Line Items] | ||||
| Total segment gross profit | 141,081 | 133,088 | 288,148 | 245,161 |
| Corporate Finance | Operating Segments | ||||
| Segment Reporting [Line Items] | ||||
| Revenues | 411,399 | 379,239 | 820,901 | 722,884 |
| Compensation expenses | 247,199 | 224,942 | 487,932 | 435,360 |
| Other segment items | 23,119 | 21,209 | 44,821 | 42,363 |
| Direct costs | 270,318 | 246,151 | 532,753 | 477,723 |
| FLC | ||||
| Segment Reporting [Line Items] | ||||
| Total segment gross profit | 68,213 | 65,757 | 133,678 | 138,398 |
| FLC | Operating Segments | ||||
| Segment Reporting [Line Items] | ||||
| Revenues | 194,254 | 186,517 | 387,132 | 377,119 |
| Compensation expenses | 120,840 | 114,485 | 242,376 | 225,363 |
| Other segment items | 5,201 | 6,275 | 11,078 | 13,358 |
| Direct costs | 126,041 | 120,760 | 253,454 | 238,721 |
| Economic Consulting | ||||
| Segment Reporting [Line Items] | ||||
| Total segment gross profit | 37,452 | 41,814 | 58,025 | 83,230 |
| Economic Consulting | Operating Segments | ||||
| Segment Reporting [Line Items] | ||||
| Revenues | 188,812 | 191,657 | 364,460 | 371,518 |
| Compensation expenses | 138,755 | 134,904 | 282,429 | 264,009 |
| Other segment items | 12,605 | 14,939 | 24,006 | 24,279 |
| Direct costs | 151,360 | 149,843 | 306,435 | 288,288 |
| Technology | ||||
| Segment Reporting [Line Items] | ||||
| Total segment gross profit | 31,836 | 24,735 | 65,143 | 57,633 |
| Technology | Operating Segments | ||||
| Segment Reporting [Line Items] | ||||
| Revenues | 99,017 | 83,599 | 201,340 | 180,755 |
| Compensation expenses | 38,698 | 36,519 | 77,375 | 73,650 |
| Other segment items | 28,483 | 22,345 | 58,822 | 49,472 |
| Direct costs | 67,181 | 58,864 | 136,197 | 123,122 |
| Strategic Communications | ||||
| Segment Reporting [Line Items] | ||||
| Total segment gross profit | 37,691 | 37,127 | 78,106 | 67,453 |
| Strategic Communications | Operating Segments | ||||
| Segment Reporting [Line Items] | ||||
| Revenues | 99,982 | 102,650 | 202,976 | 189,668 |
| Compensation expenses | 52,758 | 49,538 | 104,880 | 95,017 |
| Other segment items | 9,533 | 15,985 | 19,990 | 27,198 |
| Direct costs | $ 62,291 | $ 65,523 | $ 124,870 | $ 122,215 |
| X | ||||||||||
- Definition The aggregate direct operating costs incurred during the reporting period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of expense for employee benefit and equity-based compensation. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of other expense (income) and loss (gain) calculated as difference between segment revenue and separately disclosed expense category to arrive at segment profit (loss). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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