Segments - Additional information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information
General contracting and real estate services revenues	$ 91,936	$ 217,146	$ 105,859
General contracting and real estate services revenues | General contracting and real estate services
Segment Reporting Information
General contracting and real estate services revenues	91,936	217,146	105,859
General contracting and real estate services expenses	88,100	209,472	101,538
General contracting and real estate services revenues | General contracting and real estate services | Intersegment Eliminations
Segment Reporting Information
General contracting and real estate services revenues	27,800	26,600	99,900
General contracting and real estate services expenses	$ 27,600	$ 26,300	$ 99,000