Segments - Intercompany (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information
General contracting and real estate services revenues	$ 41,309	$ 53,822	$ 47,066	$ 29,071	$ 32,060	$ 31,532	$ 20,495	$ 19,234	$ 171,268	$ 103,321	$ 82,516
General contracting and real estate services expenses									165,344	98,754	78,813
Non-cash stock compensation									931	917	1,249
General Contracting And Real Estate Services
Segment Reporting Information
General contracting and real estate services revenues									171,268	103,321	82,516
General contracting and real estate services expenses									165,344	98,754	78,813
Non-cash stock compensation									200
General Contracting And Real Estate Services | Intersegment Eliminations [Member]
Segment Reporting Information
General contracting and real estate services revenues									(43,100)	(85,400)	(35,700)
General contracting and real estate services expenses									$ (42,800)	$ (84,600)	$ (35,400)