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Statements of Changes in Partners' Capital (Parenthetical) - shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Addition of partnership units [1] 66,825,000 23,900,000 32,500,000
Redemption of partnership units [1] 53,350,000 24,250,000 28,800,000
[1] On January 4, 2018, there was a 1-for-4 reverse share split. The Statement of Changes in Partners’ Capital have been adjusted for the period shown to reflect the 1-for-4 reverse share split on a retroactive basis.