Fair Value Measurements - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2011 Property acre	Jun. 30, 2012	Jun. 30, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest income		$ 200,000	$ 300,000
Standby guarantee liability		800,000
Carrying amount of long-lived assets written down to fair value	4,600,000		4,600,000
Long-lived assets, fair value	2,900,000		2,900,000
Impairment charges	1,697,000		2,479,000
Impaired predevelopment costs			$ 800,000
Number of homes to be disposed of	4
Number of homes to be disposed of, parcel of land in acres	53