Subsequent Events - Additional Information (Detail) (USD $)	7 Months Ended	9 Months Ended													0 Months Ended					0 Months Ended
	Jul. 31, 2014	Sep. 30, 2013	Sep. 30, 2014 5400 Westheimer [Member]	Aug. 01, 2014 5400 Westheimer [Member]	Sep. 30, 2014 Waterford [Member]	Aug. 01, 2014 Waterford [Member]	Sep. 30, 2014 San Pedro, CA [Member]	Aug. 01, 2014 San Pedro, CA [Member]	Sep. 30, 2014 Kroger Atlanta [Member]	Aug. 01, 2014 Kroger Atlanta [Member]	Sep. 30, 2014 Kroger Greensboro [Member]	Aug. 01, 2014 Kroger Greensboro [Member]	Sep. 30, 2014 Pinnacle II [Member]	Aug. 01, 2014 Pinnacle II [Member]	Oct. 15, 2014 Subsequent Event [Member] 5400 Westheimer [Member]	Oct. 01, 2014 Subsequent Event [Member] 5400 Westheimer [Member]	Oct. 16, 2014 Subsequent Event [Member] Waterford [Member]	Oct. 24, 2014 Subsequent Event [Member] San Pedro, CA [Member]	Oct. 24, 2014 Subsequent Event [Member] San Pedro, CA [Member] Property	Oct. 24, 2014 Subsequent Event [Member] San Pedro, CA [Member] Apartment Building [Member]	Oct. 20, 2014 Subsequent Event [Member] Kroger Atlanta [Member]	Oct. 20, 2014 Subsequent Event [Member] Kroger Greensboro [Member]	Oct. 22, 2014 Subsequent Event [Member] Pinnacle II [Member]
Subsequent Event [Line Items]
Net proceeds from loan repayment																$ 1,033,000
Proceeds from sale of interest in joint venture															9,690,000
Liquidation value of investment			10,912,000	10,777,000							1,750,000	2,500,000	4,979,000	4,989,000
Proceeds from sale of real estate, gross																	28,160,000	23,800,000			1,500,000	1,750,000	5,017,000
Proceeds from sale of real estate, net																	15,290,000	23,090,000			1,464,000	1,709,000	4,967,000
Liquidation value of property					28,160,000	28,160,000	23,800,000	23,800,000	1,500,000	2,000,000
Ownership percentage in real estate investment																			83.70%
Number of properties																			4
Payment of loan	$ 0	$ 23,770,000																		$ 150,000,000