Related Party Transactions - Supervisory and Other Services - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Related Party Transaction [Line Items]
Basic fee payable at rate per month	$ 3,333
Supervisory services fees	332,001	408,596
Additional payment of distributions received by the participants	10.00%
Required rate of return on cash investment for additional payment	15.00%
Original cash investment	3,600,000
Distributions profits interest	225,556	304,745
Basic annual fee	102,000
Other service fees	163,786	87,776
Profits interest	10.00%
Third-party payments	116,436	407,529
Minimum [Member]
Related Party Transaction [Line Items]
Distributions profits interest	100,000
Effective July 1, 2010 [Member]
Related Party Transaction [Line Items]
Increase in basic payment plus annual Consumer Price Index adjustment	102,000
Effective July 1, 2012 [Member]
Related Party Transaction [Line Items]
Increase in basic payment plus annual Consumer Price Index adjustment	107,190
Special supervisory services [Member]
Related Party Transaction [Line Items]
Supervisory services fees	151,070	109,560
Lessee [Member]
Related Party Transaction [Line Items]
Distributions profits interest	$ 162,959	$ 412,960