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Business Combinations - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021 | Oct. 04, 2021 | Mar. 31, 2021
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 1,070,442 |  |  | $ 671,065
GCA Corporation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash and cash equivalents | 228,877 | $ 226,550 |  |
Measurement period adjustments, cash and cash equivalents | 2,327 |  |  |
Investment securities | 515 | 515 |  |
Accounts receivable | 54,804 | 53,431 |  |
Measurement period adjustments, accounts receivable | 1,373 |  |  |
Unbilled work in progress | 4,672 | 4,672 |  |
Income taxes receivable | 1,771 | 0 |  |
Measurement period adjustments, income taxes receivable | 1,771 |  |  |
Property and equipment | 8,727 | 8,727 |  |
Operating lease right-of-use assets | 27,383 | 27,383 |  |
Receivable from affiliates | 0 | 1,288 |  |
Measurement period adjustments, receivable from affiliates | (1,288) |  |  |
Other assets | 20,506 | 20,503 |  |
Measurement period adjustments, other assets | 3 |  |  |
Total intangible assets acquired | 74,300 | 74,300 |  |
Total assets | 421,555 | 417,369 |  |
Measurement period adjustments, total assets | 4,186 |  |  |
Accrued salaries and bonuses | 152,409 | 152,409 |  |
Accounts payable and accrued expenses | 22,722 | 22,627 |  |
Measurement period adjustments, accounts payable and accrued expenses | 95 |  |  |
Payable to affiliates | 15 | 15 |  |
Deferred income | 78 | 78 |  |
Deferred income taxes | 3,552 | 3,199 |  |
Measurement period adjustments, deferred income taxes | 353 |  |  |
Income taxes payable | 0 | 5,857 |  |
Measurement period adjustments, income taxes payable | (5,857) |  |  |
Operating lease liabilities | 27,527 | 27,527 |  |
Other liabilities | 19,897 | 19,897 |  |
Total liabilities | 226,200 | 231,609 |  |
Measurement period adjustments, liabilities | (5,409) |  |  |
Net identifiable assets acquired | 195,355 | 185,760 |  |
Measurement period adjustments, net identifiable assets acquired | 9,595 |  |  |
Goodwill | 394,214 | 403,809 | $ 394,200 |
Measurement period adjustments, goodwill | (9,595) |  |  |
Total GCA equity value | $ 589,569 | 589,569 |  |
Weighted-Average Amortization Period | 1 year 3 months 18 days |  |  |
GCA Corporation | Backlog |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total intangible assets acquired | $ 42,000 | 42,000 |  |
Weighted-Average Amortization Period | 1 year 2 months 12 days |  |  |
GCA Corporation | Trade name |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total intangible assets acquired | $ 17,100 | 17,100 |  |
Weighted-Average Amortization Period | 2 years |  |  |
GCA Corporation | Customer relationships |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total intangible assets acquired | $ 15,200 | $ 15,200 |  |
Weighted-Average Amortization Period | 1 year |  |  |

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=128092470&loc=d3e4845-128472 + Details
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