Inventory - Recoverability Schedule of Inventory Assets Held for Development, by Reportable Segment (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) Community	Mar. 31, 2015 USD ($) property Community
Real Estate Properties [Line Items]
Number of Communities on Watch List	2	2
Undiscounted Cash Flow Analysis Prepared for Number of Communities	2	2
Undiscounted Cash Flow Analysis, Pre-analysis Book Value | $	$ 21,914
West Segment
Real Estate Properties [Line Items]
Number of Communities on Watch List	2	1
Undiscounted Cash Flow Analysis Prepared for Number of Communities	2	0
Undiscounted Cash Flow Analysis, Pre-analysis Book Value | $	$ 20,809	$ 0
Undiscounted Cash Flow Analysis, Aggregate Undiscounted Cash Flow, Percentage of Book Value	108.00%	0.00%
Corporate and unallocated
Real Estate Properties [Line Items]
Number of Communities on Watch List	0
Undiscounted Cash Flow Analysis Prepared for Number of Communities	0
Undiscounted Cash Flow Analysis, Pre-analysis Book Value | $	$ 1,105