FINANCIAL DATA HIGHLIGHTS (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Interest income, net	$ 0.0000	[1]	$ 0.0003	[1]	$ 0.0008	[1]
Maximum
Interest income, net	$ 0.0001		$ 0.0001		$ 0.0001

[1] Interest income, net is less than $0.0001 per Unit