Statements of Financial Condition (Parenthetical) - shares	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
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)	96,552,190	99,944,485
Limited partners: units outstanding (in shares)	96,552,190	99,944,485