Variable Interest Entities and Joint Ventures - Condensed Balance Sheets of Consolidated JV (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Variable Interest Entity [Line Items]
Cash	$ 906	$ 462
Restricted cash	505	503
Other assets	833	125
Land under development	13,382	19,092
Total assets	15,626	20,182	22,371
Debt	4,574	4,983
Accrued expenses	935	108
Equity	10,117	15,091
Total liabilities and equity	$ 15,626	$ 20,182