17. Discontinued Operations and Real Estate Interests Held for Sale (Detail) - (Table 1) Results of Operations for the Real Estate Interests Classified into Discontinued Operations (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Rental and related revenue	$ 726,664	$ 676,810
Marina revenue	1,100,458	1,064,505
Total revenue	8,006,279	7,598,450
Rental operating expenses	651,376	676,675
Marina expenses	464,439	337,399
Interest expense	746,949	805,035
Depreciation, amortization and other expenses	898,985	1,147,525
Total expenses	9,443,079	9,493,019
Income from discontinued operations	833,699	665,110
Segment, Discontinued Operations [Member] | Grove Isle [Member]
Rental operating expenses	4,000	49,000
Marina expenses	495,000	519,000
Spa expenses	392,000	538,000
Interest expense	124,000	97,000
Depreciation, amortization and other expenses	277,000	458,000
Total expenses	1,292,000	1,661,000
Grove Isle [Member] | Segment, Discontinued Operations [Member]
Rental and related revenue	1,139,000	1,204,000
Marina revenue	557,000	556,000
Spa revenue	430,000	535,000
Other		31,000
Total revenue	2,126,000	2,326,000
Grove Isle [Member]
Income from discontinued operations	$ 834,000	$ 665,000