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