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Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Payables And Accruals [Abstract] |  |
Salaries and wages | $ 72,498 | $ 46,685
Employee benefits | 293,768 | 259,081
Self-insurance liability | 32,447 | 29,997
Project cost accruals | 164,243 | 217,729
Other accrued expenses | 87,797 | 86,371
Total accrued expenses and other current liabilities | $ 650,753 | $ 639,863

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