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Business Segments and Geographic Information - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) Segment | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Number of reportable business segments | Segment |  |  | 4 |  |
Equity in earnings (losses) of affiliates, net of income tax provision | $ 1,640 | $ 2,243 | $ 5,647 | $ 7,202 |
SACS |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage in entity |  |  | 50.00% |  |
Equity in earnings (losses) of affiliates, net of income tax provision |  |  | $ 2,700 | 2,800 |
Investment in joint venture | 10,700 |  | 10,700 |  | $ 11,100
GEO Amey |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Equity in earnings (losses) of affiliates, net of income tax provision |  |  | 2,900 | $ 4,400 |
Advances to affiliate | $ 9,400 |  | $ 9,400 |  | $ 11,800

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