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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Income Tax Disclosure [Abstract] |  |
Project and non-project reserves | $ 24,668 | $ 33,824
Employee compensation and benefits | 60,397 | 61,260
Revenue and cost recognition | 28,930 | 25,312
Insurance accruals | 16,661 | 17,724
Net operating losses | 11,589 | 9,674
Lease liabilities | 54,926 | 62,994
Tax credit carryforwards | 21,818 | 15,566
Other | 3,323 | 3,296
Valuation allowance | (27,348) | (23,878)
Total deferred tax assets | 194,964 | 205,772
Deferred tax liabilities |  |
Intangible assets | (16,542) | (15,620)
Right of use assets | (48,993) | (56,099)
Other | (6,436) | (16,138)
Total deferred tax liabilities | (71,971) | (87,857)
Net deferred tax asset | $ 122,993 | $ 117,915

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