v2.4.1.9
Organization - Schedule of Share Splits and Reverse Share Splits (Detail)
 3 Months Ended
Mar. 31, 2015
Organization [Line Items]  
Funds Reverse Split There were no reverse Share splits during the three months ended March 31, 2015.
Funds Split There were no Share splits during the three months ended March 31, 2015.
ProShares VIX Mid-Term Futures ETF [Member] | November Six Two Thousand Fourteen Reverse Share Split [Member]  
Organization [Line Items]  
Execution Date (Prior to Opening of Trading) November 6, 2014
Date Trading Resumed at Post- Split Price November 6, 2014
Funds Reverse Split 1-for-4 reverse Share split
ProShares Short VIX Short-Term Futures ETF [Member] | January Twenty One Two Thousand Fourteen Share Split [Member]  
Organization [Line Items]  
Execution Date (Prior to Opening of Trading) January 21, 2014
Date Trading Resumed at Post- Split Price January 24, 2014
Funds Split 2-for-1 Share split
ProShares Ultra VIX Short-Term Futures ETF [Member] | January Twenty One Two Thousand Fourteen Reverse Share Split [Member]  
Organization [Line Items]  
Execution Date (Prior to Opening of Trading) January 21, 2014
Date Trading Resumed at Post- Split Price January 24, 2014
Funds Reverse Split 1-for-4 reverse Share split
ProShares Ultra Silver [Member] | January Twenty One Two Thousand Fourteen Reverse Share Split [Member]  
Organization [Line Items]  
Execution Date (Prior to Opening of Trading) January 21, 2014
Date Trading Resumed at Post- Split Price January 24, 2014
Funds Reverse Split 1-for-4 reverse Share split