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Investments in Affiliates and Other Entities - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Distributions to non-controlling interests | $ 934 | $ 8,199 | $ 1,177 | $ 8,741 |  |  |  |
Accounts receivable, net | 4,430,757 |  |  |  |  | $ 4,430,757 |  | $ 4,410,829
Accounts payable and accrued expenses | 3,198,967 |  |  |  |  | 3,198,967 |  | 3,061,242
Revenues | 5,594,387 |  | 5,048,610 |  |  | 10,626,206 | $ 9,477,436 |
Cost of services | 4,783,056 |  | 4,324,511 |  |  | 9,191,381 | 8,180,142 |
Equity in earnings of integral unconsolidated affiliates | 8,586 |  | 9,370 |  |  | 20,920 | 18,990 |
Carrying amount that exceed share of underlying net equity in net assets | 28,600 |  |  |  |  | 28,600 |  | 31,400
Amortization of equity method investment, difference between carrying amount and underlying equity | 1,300 |  | 1,500 |  |  | 2,700 | 3,300 |
Non-controlling Interests |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Distributions to non-controlling interests | 934 | $ 8,199 | 1,177 | $ 8,741 |  |  |  |
Non-Integral Unconsolidated Affiliates |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Realized gain (loss) on disposal |  |  |  |  | $ 25,900 | 12,600 |  |
Cash received |  |  |  |  |  | 35,400 | 58,500 |
Equity in earnings (loss) of non-integral unconsolidated affiliates | (500) |  | 500 |  |  | 3,100 | 2,100 |
Non-Integral Unconsolidated Affiliates | Non-controlling Interests |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Realized gain (loss) on disposal |  |  |  |  | $ 10,400 | 5,000 |  |
Distributions to non-controlling interests |  |  |  |  |  | 5,000 | 9,800 |
Integral Affiliates | Related Party |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Accounts receivable, net | 56,700 |  |  |  |  | 56,700 |  | 96,400
Accounts payable and accrued expenses | 18,900 |  |  |  |  | 18,900 |  | $ 24,500
Revenues | 57,700 |  | 50,200 |  |  | 116,700 | 98,500 |
Cost of services | 100,300 |  | 21,200 |  |  | 189,200 | 33,200 |
Integral Unconsolidated Affiliates | Related Party |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity in earnings of integral unconsolidated affiliates | 8,600 |  | $ 9,400 |  |  | 20,900 | $ 19,000 |
Integral and Non-Integral Unconsolidated Affiliates |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Undistributed earnings of unconsolidated affiliates | $ 43,500 |  |  |  |  | $ 43,500 |  |

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