Statements of Financial Condition (Parenthetical)	Dec. 31, 2011	Dec. 31, 2010
Partners' capital:
General Partner: units issued (in shares)	100,000	100,000
General Partner: units outstanding (in shares)	100,000	100,000
Limited partners: units issued (in shares)	105,073,342	104,986,799
Limited partners: units outstanding (in shares)	105,073,342	104,986,799