STATEMENTS OF FINANCIAL CONDITION - NET ASSET VALUE PER UNIT (USD $)	Dec. 31, 2012 Class A	Dec. 31, 2011 Class A	Dec. 31, 2010 Class A	Dec. 31, 2009 Class A	Dec. 31, 2012 Class C	Dec. 31, 2011 Class C	Dec. 31, 2010 Class C	Dec. 31, 2009 Class C	Dec. 31, 2012 Class D	Dec. 31, 2011 Class D	Dec. 31, 2010 Class D	Dec. 31, 2009 Class D	Dec. 31, 2012 Class I	Dec. 31, 2011 Class I	Dec. 31, 2010 Class I	Dec. 31, 2009 Class I	Dec. 31, 2012 Class DS	Dec. 31, 2011 Class DS	Dec. 31, 2010 Class DS	Dec. 31, 2009 Class DS	Dec. 31, 2012 Class DT	Dec. 31, 2011 Class DT	Dec. 31, 2010 Class DT		Jan. 31, 2010 Class DT		Dec. 31, 2012 Class M		Dec. 01, 2012 Class M
NET ASSET VALUE PER UNIT:
Net asset value per unit (in dollars per unit)	$ 1.1196	$ 1.1479	$ 1.1785	$ 1.0724	$ 1.0838	$ 1.1223	$ 1.1639	$ 1.0698	$ 1.1740	$ 1.1857	$ 1.1993	$ 1.0750	$ 1.1399	$ 1.1641	$ 1.1904	$ 1.0789	$ 1.3830	$ 1.3968	$ 1.4128	$ 1.2665	$ 1.1598	$ 1.1614	$ 1.1650	[1]	$ 1.0000	[1]	$ 1.0235	[2]	$ 1.0114	[2]

[1] Units issued on February 1, 2010.

[2] Units issued on December 1, 2012.