Segments - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information
General contracting and real estate services revenues	$ 33,200	$ 47,066	$ 70,003	$ 76,137
General contracting and real estate services expenses	32,025	45,283	67,062	73,425
Non-cash stock compensation			652	582
General and Administrative Expense
Segment Reporting Information
Non-cash stock compensation	200	200	500	400
General contracting and real estate services | Maximum
Segment Reporting Information
Non-cash stock compensation	100	100	300	100
General contracting and real estate services | Intersegment Eliminations
Segment Reporting Information
General contracting and real estate services revenues	17,900	8,000	32,900	16,500
General contracting and real estate services expenses	$ 17,800	$ 8,000	$ 32,600	$ 16,400