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Investments in Affiliates and Other Entities - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Distributions to non-controlling interests | $ 865 | $ 934 | $ 8,199 | $ 195 | $ 1,177 | $ 8,741 |  |  |  |
Accounts receivable, net | 5,149,915 |  |  |  |  |  |  | $ 5,149,915 |  | $ 4,410,829
Accounts payable and accrued expenses | 3,999,027 |  |  |  |  |  |  | 3,999,027 |  | 3,061,242
Revenues | 6,493,167 |  |  | 5,620,822 |  |  |  | 17,119,373 | $ 15,098,258 |
Cost of services | 5,480,597 |  |  | 4,773,498 |  |  |  | 14,671,978 | 12,953,640 |
Equity in earnings of integral unconsolidated affiliates | 14,015 |  |  | 11,707 |  |  |  | 34,935 | 30,697 |
Carrying amount that exceed share of underlying net equity in net assets | 27,800 |  |  |  |  |  |  | 27,800 |  | 31,400
Amortization of equity method investment, difference between carrying amount and underlying equity | 900 |  |  | 1,500 |  |  |  | 3,600 | 4,700 |
Non-controlling Interests |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Distributions to non-controlling interests | 865 | $ 934 | $ 8,199 | 195 | $ 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 | (1,700) |  |  | (1,000) |  |  |  | 1,400 | 1,100 |
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 | 109,000 |  |  |  |  |  |  | 109,000 |  | 96,400
Accounts payable and accrued expenses | 25,800 |  |  |  |  |  |  | 25,800 |  | $ 24,500
Revenues | 58,500 |  |  | 54,400 |  |  |  | 175,200 | 152,900 |
Cost of services | 114,200 |  |  | 72,400 |  |  |  | 303,400 | 107,300 |
Integral Unconsolidated Affiliates | Related Party |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity in earnings of integral unconsolidated affiliates | 14,000 |  |  | $ 11,700 |  |  |  | 34,900 | $ 30,700 |
Integral and Non-Integral Unconsolidated Affiliates |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Undistributed earnings of unconsolidated affiliates | $ 48,700 |  |  |  |  |  |  | $ 48,700 |  |
Hybar LLC (Hybar) |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity interest (in percent) | 20.80% |  |  |  |  |  |  | 20.80% |  |
Payments to interest in entity | $ 60,000 |  |  |  |  |  |  |  |  |

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