Accrued Expenses and Other Liabilities - Changes in Warranty Accrual (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning warranty liability		$ 4,931	$ 4,181
Adjustment to warranty accrual		900
Ending warranty liability	$ 6,859	6,859	4,931	$ 4,181
Homebuilding Segment [Member]
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning warranty liability		4,608	3,846	1,277
Warranty provision		1,825	1,921	2,802
Warranty assumed from joint ventures at consolidation		781	469	0
Warranty payments		(989)	(563)	(233)
Adjustment to warranty accrual	800	409	(1,065)	0
Ending warranty liability	6,634	6,634	4,608	3,846
Fee Building Segment [Member]
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning warranty liability		323	335	301
Warranty provision		0	0	57
Warranty payments		(3)	(12)	(23)
Adjustment to warranty accrual	63	(95)	0	0
Ending warranty liability	$ 225	$ 225	$ 323	$ 335