Real Estate Held for Investment (Detail) (USD $)	9 Months Ended	0 Months Ended	12 Months Ended			0 Months Ended	12 Months Ended	9 Months Ended
	Sep. 30, 2012	Oct. 21, 2011 Staples Clermont FL	Oct. 21, 2012 Staples Clermont FL	Mar. 16, 2012 PetSmart Galveston TX Leases, Acquired-in-Place [Member]	Mar. 16, 2012 PetSmart Galveston TX Above Market Leases [Member]	Mar. 16, 2012 PetSmart Galveston TX	Mar. 16, 2013 PetSmart Galveston TX	Sep. 30, 2012 Leases, Acquired-in-Place [Member]	Sep. 30, 2011 Leases, Acquired-in-Place [Member]	Sep. 30, 2012 Above Market Leases [Member]	Sep. 30, 2011 Above Market Leases [Member]
Business Acquisition, Effective Date of Acquisition		Oct. 21, 2011				Mar. 16, 2012
Business Acquisition, Percentage of Voting Interests Acquired		28.00%				34.00%
Business Acquisition, Cost of Acquired Entity, Cash Paid		$ 897,288				$ 824,500
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets		116,953		121,149	83,303	204,452
Business Acquisition, Cost of Acquired Entity, Transaction Costs		18,941				21,557
Average Lease Term		8.4				10.0
Real Estate Revenue, Net			73,031				65,560
Business Acquisition, Name of Acquired Entity		Staples store in Clermont, Florida				PetSmart store in Galveston, Texas
Amortization of Acquired Intangible Assets								15,470	0
Amortization of above and below Market Leases										3,471	0
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	115 months
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months								$ 26,010		$ 8,330