Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items]
Maximum maturity period for highly liquid investment		3 months
Building improvements, estimated useful life		39 years
Additional rent		$ 1,053,800	$ 1,053,800
Primary overage rent recorded period		12 months
Asset impairment charges		0	0
Aggregate net assets exceeded tax bases		8,625,000	7,362,800
Associates incurred external offering costs		3,310,685
Deferred offering costs		1,625,927	1,323,191
Offering costs due to Supervisor		788,294	922,728
Additional offering costs for work done by employees of Supervisor		290,042	228,603
Impact of error correction accumulated	30,593		455,301
Building [Member]
Summary Of Significant Accounting Policies [Line Items]
Building improvements program costs		78,393,622	74,308,199
Building improvements and equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Building improvements program costs		67,909,708	66,810,647
Tenant improvements [Member]
Summary Of Significant Accounting Policies [Line Items]
Building improvements program costs		8,779,779	5,793,417
Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Building improvements program costs		$ 130,000	$ 130,000