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Acquisitions - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed on Purchase Price Allocation (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Aug. 23, 2023 | Apr. 13, 2023 | Dec. 31, 2022 | May 31, 2022
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Contract assets | $ 756,630 |  |  | $ 634,033 |
Goodwill | 1,797,330 |  |  | 1,661,850 |
Investments in and advances to unconsolidated joint ventures | 164,858 |  |  | 107,425 |
Contract liabilities | $ (277,249) |  |  | $ (213,064) |
Sealing Technologies, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and cash equivalents |  | $ 8,133 |  |  |
Accounts receivable |  | 17,889 |  |  |
Contract assets |  | 2,960 |  |  |
Other current assets |  | 1,379 |  |  |
Property and equipment |  | 1,635 |  |  |
Right of use assets, operating leases |  | 1,288 |  |  |
Deferred tax assets |  | 686 |  |  |
Goodwill |  | 106,241 |  |  |
Intangible assets |  | 59,900 |  |  |
Accounts payable |  | (15,987) |  |  |
Accrued expenses and other current liabilities |  | (2,377) |  |  |
Contract liabilities |  | (493) |  |  |
Short-term lease liabilities |  | (540) |  |  |
Deferred tax liabilities |  | (330) |  |  |
Long-term lease liabilities |  | (551) |  |  |
Net assets acquired |  | $ 179,833 |  |  |
IPKeys Power Partners |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and cash equivalents |  |  | $ 126 |  |
Accounts receivable |  |  | 3,937 |  |
Contract assets |  |  | 834 |  |
Other current assets |  |  | 422 |  |
Property and equipment |  |  | 86 |  |
Right of use assets, operating leases |  |  | 129 |  |
Goodwill |  |  | 24,126 |  |
Intangible assets |  |  | 23,000 |  |
Other noncurrent assets |  |  | 56 |  |
Accounts payable |  |  | (541) |  |
Accrued expenses and other current liabilities |  |  | (1,768) |  |
Contract liabilities |  |  | (1,936) |  |
Deferred tax liabilities |  |  | (5,432) |  |
Net assets acquired |  |  | $ 43,039 |  |
Xator Corporation |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and cash equivalents |  |  |  |  | $ 8,935
Accounts receivable |  |  |  |  | 7,393
Contract assets |  |  |  |  | 24,332
Prepaid expenses and other current assets |  |  |  |  | 3,615
Property and equipment |  |  |  |  | 1,699
Right of use assets, operating leases |  |  |  |  | 7,517
Goodwill |  |  |  |  | 257,934
Investments in and advances to unconsolidated joint ventures |  |  |  |  | 698
Intangible assets |  |  |  |  | 123,500
Other noncurrent assets |  |  |  |  | 9,156
Accounts payable |  |  |  |  | (6,626)
Accrued expenses and other current liabilities |  |  |  |  | (31,309)
Contract liabilities |  |  |  |  | (2,631)
Short-term lease liabilities, operating leases |  |  |  |  | (2,371)
Long-term lease liabilities, operating leases |  |  |  |  | (5,146)
Other long-term liabilities |  |  |  |  | (9,156)
Net assets acquired |  |  |  |  | $ 387,540

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