Summary of Geographic Information Relating to Sources, by Nation, of Partnership's Total Revenues and Long-lived Tangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 1,200	$ 1,318	$ 2,378	$ 2,186
Percentage of total revenue			100.00%	100.00%
Long-lived assets	7,160		7,160		7,549
Percentage of Long-lived assets	100.00%		100.00%		100.00%
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue			2,218	2,036
Percentage of total revenue			93.00%	93.00%
Long-lived assets	6,920		6,920		7,309
Percentage of Long-lived assets	97.00%		97.00%		97.00%
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue				16
Percentage of total revenue			0.00%	1.00%
Percentage of Long-lived assets	0.00%		0.00%		0.00%
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue			160	134
Percentage of total revenue			7.00%	6.00%
Long-lived assets	240		240		240
Percentage of Long-lived assets	3.00%		3.00%		3.00%
Total International
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue			160	150
Percentage of total revenue			7.00%	7.00%
Long-lived assets	$ 240		$ 240		$ 240
Percentage of Long-lived assets	3.00%		3.00%		3.00%