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Acquisitions - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed on Purchase Price Allocation (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Nov. 01, 2024 | Aug. 16, 2024 | Dec. 31, 2023 | Aug. 23, 2023 | Apr. 13, 2023 | Dec. 31, 2022 | May 31, 2022
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Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Contract assets | $ 741,504 |  |  | $ 757,515 |  |  |  |
Goodwill | 2,082,680 |  |  | 1,792,665 |  |  | $ 1,661,850 |
Investments in and advances to unconsolidated joint ventures | 138,759 |  |  | 128,204 |  |  |  |
Contract liabilities | $ (289,799) |  |  | $ (301,107) |  |  |  |
BCC Engineering, LLC |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 2,839 |  |  |  |  |  |
Accounts receivable |  | 24,142 |  |  |  |  |  |
Contract assets |  | 16,649 |  |  |  |  |  |
Prepaid expenses and other current assets |  | 2,483 |  |  |  |  |  |
Right of use assets, operating leases |  | 9,438 |  |  |  |  |  |
Property and equipment |  | 1,586 |  |  |  |  |  |
Goodwill |  | 174,532 |  |  |  |  |  |
Intangible assets |  | 32,400 |  |  |  |  |  |
Other noncurrent assets |  | 1,743 |  |  |  |  |  |
Accounts payable |  | (8,668) |  |  |  |  |  |
Accrued expenses and other current liabilities |  | (7,236) |  |  |  |  |  |
Contract liabilities |  | (4,446) |  |  |  |  |  |
Short-term lease liabilities, operating leases |  | (1,977) |  |  |  |  |  |
Deferred income taxes |  | (2,203) |  |  |  |  |  |
Long-term lease liabilities, operating leases |  | (7,462) |  |  |  |  |  |
Other long-term liabilities |  | (1,155) |  |  |  |  |  |
Net assets acquired |  | $ 232,665 |  |  |  |  |  |
BlackSignal Technologies, LLC. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  | $ 4,917 |  |  |  |  |
Accounts receivable |  |  | 5,171 |  |  |  |  |
Contract assets |  |  | 3,209 |  |  |  |  |
Prepaid expenses and other current assets |  |  | 447 |  |  |  |  |
Right of use assets, operating leases |  |  | 5,370 |  |  |  |  |
Property and equipment |  |  | 997 |  |  |  |  |
Goodwill |  |  | 119,663 |  |  |  |  |
Intangible assets |  |  | 97,600 |  |  |  |  |
Other assets |  |  | 145 |  |  |  |  |
Accounts payable |  |  | (951) |  |  |  |  |
Accrued expenses and other current liabilities |  |  | (4,999) |  |  |  |  |
Short-term lease liabilities, operating leases |  |  | (800) |  |  |  |  |
Deferred income taxes |  |  | (22,461) |  |  |  |  |
Long-term lease liabilities, operating leases |  |  | (4,570) |  |  |  |  |
Net assets acquired |  |  | $ 203,738 |  |  |  |  |
Sealing Technologies, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | $ 8,133 |  |  |
Accounts receivable |  |  |  |  | 17,889 |  |  |
Contract assets |  |  |  |  | 2,946 |  |  |
Prepaid expenses and other current assets |  |  |  |  | 1,379 |  |  |
Right of use assets, operating leases |  |  |  |  | 1,836 |  |  |
Property and equipment |  |  |  |  | 2,025 |  |  |
Goodwill |  |  |  |  | 90,593 |  |  |
Deferred tax assets |  |  |  |  | 357 |  |  |
Intangible assets |  |  |  |  | 75,000 |  |  |
Accounts payable |  |  |  |  | (15,987) |  |  |
Accrued expenses and other current liabilities |  |  |  |  | (2,408) |  |  |
Contract liabilities |  |  |  |  | (668) |  |  |
Short-term lease liabilities, operating leases |  |  |  |  | (418) |  |  |
Long-term lease liabilities, operating leases |  |  |  |  | (1,418) |  |  |
Net assets acquired |  |  |  |  | $ 179,259 |  |  |
IPKeys Power Partners |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  | $ 126 |  |
Accounts receivable |  |  |  |  |  | 3,937 |  |
Contract assets |  |  |  |  |  | 834 |  |
Prepaid expenses and other current assets |  |  |  |  |  | 455 |  |
Right of use assets, operating leases |  |  |  |  |  | 1,105 |  |
Property and equipment |  |  |  |  |  | 86 |  |
Goodwill |  |  |  |  |  | 22,407 |  |
Intangible assets |  |  |  |  |  | 23,000 |  |
Other noncurrent assets |  |  |  |  |  | 152 |  |
Accounts payable |  |  |  |  |  | (541) |  |
Accrued expenses and other current liabilities |  |  |  |  |  | (1,768) |  |
Contract liabilities |  |  |  |  |  | (1,936) |  |
Short-term lease liabilities, operating leases |  |  |  |  |  | (343) |  |
Long-term lease liabilities, operating leases |  |  |  |  |  | (762) |  |
Deferred tax liabilities |  |  |  |  |  | (3,713) |  |
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
Right of use assets, operating leases |  |  |  |  |  |  |  | 7,517
Property and equipment |  |  |  |  |  |  |  | 1,699
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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