Variable Interest Entities and Joint Ventures - Condensed Balance Sheets of Consolidated JV (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Cash	$ 543	$ 906
Restricted cash	505	505
Other assets	873	833
Land under development	9,515	13,382
Total assets	11,436	15,626
Debt	2,539	4,574
Accrued expenses	791	935
Equity	8,106	10,117
Total liabilities and equity	$ 11,436	$ 15,626