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Acquisitions - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed on Preliminary Purchase Price Allocation (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Nov. 19, 2020
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Contract assets | $ 607,676 | $ 576,568 |
Goodwill | 1,261,189 | 1,261,978 |
Contract liabilities | $ (186,028) | $ (201,864) |
Braxton Science Technology Group |  |  |
Business Acquisition [Line Items] |  |  |
Cash and cash equivalents |  |  | $ 7,006
Accounts receivable |  |  | 18,163
Contract assets |  |  | 8,350
Prepaid expenses and other current assets |  |  | 3,036
Property and equipment |  |  | 5,114
Right of use assets, operating leases |  |  | 10,788
Goodwill |  |  | 211,524
Intangible assets |  |  | 74,950
Accounts payable |  |  | (7,464)
Accrued expenses and other current liabilities |  |  | (9,845)
Contract liabilities |  |  | (300)
Short-term lease liabilities, operating leases |  |  | (1,915)
Long-term lease liabilities, operating leases |  |  | (8,873)
Deferred tax liabilities |  |  | (1,694)
Net assets acquired |  |  | $ 308,840

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