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Income Taxes - Summary of Net Deferred Tax Assets and (Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Deferred income tax assets: |  |
Self-insurance reserves | $ 3,850 | $ 2,979
Contract loss reserves | 2,273 | 842
Stock-based awards | 3,336 | 2,071
Bonus | 11,137 | 8,656
Accrued vacation | 2,295 | 2,227
Accrued profit sharing | 1,707 | 2,030
Operating lease liabilities | 8,115 | 6,691
Non-U.S. operating loss | 2,411 | 2,402
Other | 1,090 | 1,112
Total deferred income tax assets before valuation allowances | 36,214 | 29,010
Less: valuation allowances | (2,412) | (2,402)
Total deferred income tax assets | 33,802 | 26,608
Deferred income tax liabilities: |  |
Property and equipment — tax over book depreciation | (45,332) | (42,413)
Non-U.S. intangible assets — tax over book amortization | (10,363) | (11,086)
Intangible assets — tax over book amortization | (4,013) | (3,331)
Right-of-use operating lease assets | (8,115) | (6,688)
Non-U.S. deferred income tax liabilities | (8,819) | (4,709)
Contract revenue adjustment | (4,790) | (4,023)
Other | (600) | (133)
Total deferred income tax liabilities | (82,032) | (72,383)
Net deferred income taxes | $ (48,230) | $ (45,775)

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