Description of Business and Basis of Presentation - Additional Information (Detail) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Mar. 31, 2011 acre	Sep. 30, 2012	Sep. 30, 2011
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Land owned (in acres)				567,000
Minimum projected price appreciation over time				0.00%
Maximum projected price appreciation over time				10.00%
Estimated developer profit based on development costs				20.00%
Future holding period of operating properties (in years)				13 years
Timber deed revenue	$ 9,558,000	$ 8,186,000		$ 28,784,000	$ 78,976,000
Minimum
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Length of estimated development and selling periods				4
Maximum
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Length of estimated development and selling periods				13
Timber Deed
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Timber deed sale agreement, value			55,900,000
Timber deed land owned			40,975
Percentage of buyer First Thinnings at fair market value				85.00%
Purchase price of First Thinnings	100,000	100,000		400,000	700,000
Timber deed revenue					54,500,000
Imputed land lease revenue					$ 1,400,000
Timber Deed | Maximum
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Timber deed sale agreement, term (in years)			20
Real Estate | Minimum
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Estimated Useful Life (in years)				15 years
Real Estate | Maximum
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Estimated Useful Life (in years)				40 years