Real Estate Held for Investment (Detail) (USD $)	9 Months Ended	0 Months Ended	12 Months Ended	9 Months Ended
	Sep. 30, 2012	Feb. 23, 2012 Tractor Supply Starkville, MS	Feb. 23, 2013 Tractor Supply Starkville, MS	Sep. 30, 2012 Leases, Acquired-in-Place [Member]	Sep. 30, 2011 Leases, Acquired-in-Place [Member]	Sep. 30, 2012 Below Market Leases [Member]	Sep. 30, 2011 Below Market Leases [Member]
Business Acquisition, Effective Date of Acquisition		February23, 2012
Business Acquisition, Percentage of Voting Interests Acquired		53.00%
Business Acquisition, Name of Acquired Entity		Tractor Supply Company store in Starkville, Mississippi
Business Acquisition, Cost of Acquired Entity, Cash Paid		$ 1,510,500
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets		257,767
Business Acquisition, Purchase Price Allocation, Noncurrent Liabilities		92,542
Business Acquisition, Cost of Acquired Entity, Transaction Costs		26,120
Average Lease Term		15
Real Estate Revenue, Net			115,542
Amortization of Acquired Intangible Assets				10,080	0
Amortization of above and below Market Leases						3,619	0
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	172 months
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months				$ 17,280		$ 6,204