Organization - Schedule of Share Splits and Reverse Share Splits (Detail)	12 Months Ended
	Dec. 31, 2016
ProShares Short VIX Short-Term Futures ETF [Member] | January 21, 2014 Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Jan. 21, 2014
Date Trading Resumed at Post- Split Price	Jan. 24, 2014
Type of Split	2-for-1 Share split
ProShares Ultra VIX Short-Term Futures ETF [Member] | January 21, 2014 Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Jan. 21, 2014
Date Trading Resumed at Post- Split Price	Jan. 24, 2014
Type of Split	1-for-4 reverse Share split
ProShares Ultra VIX Short-Term Futures ETF [Member] | May 20, 2015 Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	May 20, 2015
Date Trading Resumed at Post- Split Price	May 20, 2015
Type of Split	1-for-5 reverse Share split
ProShares Ultra VIX Short-Term Futures ETF [Member] | July 25, 2016 Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Jul. 25, 2016
Date Trading Resumed at Post- Split Price	Jul. 25, 2016
Type of Split	1-for-5 reverse Share split
ProShares Ultra Silver [Member] | January 21, 2014 Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Jan. 21, 2014
Date Trading Resumed at Post- Split Price	Jan. 24, 2014
Type of Split	1-for-4 reverse Share split
ProShares VIX Mid-Term Futures ETF [Member] | November 6, 2014 Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Nov. 06, 2014
Date Trading Resumed at Post- Split Price	Nov. 06, 2014
Type of Split	1-for-4 reverse Share split
ProShares Ultra Bloomberg Crude Oil [Member] | May 20, 2015 Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	May 20, 2015
Date Trading Resumed at Post- Split Price	May 20, 2015
Type of Split	1-for-5 reverse Share split
ProShares Ultra Bloomberg Natural Gas [Member] | May 20, 2015 Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	May 20, 2015
Date Trading Resumed at Post- Split Price	May 20, 2015
Type of Split	1-for-4 reverse Share split
ProShares Ultra Yen [Member] | May 20, 2015 Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	May 20, 2015
Date Trading Resumed at Post- Split Price	May 20, 2015
Type of Split	1-for-4 reverse Share split
ProShares UltraShort Silver [Member] | November 13, 2015 Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Nov. 13, 2015
Date Trading Resumed at Post- Split Price	Nov. 13, 2015
Type of Split	2-for-1 Share split
ProShares UltraShort Bloomberg Natural Gas [Member] | July 20, 2016 Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Jul. 20, 2016
Date Trading Resumed at Post- Split Price	Jul. 25, 2016
Type of Split	3-for-1 Share split
ProShares VIX Short-Term Futures ETF [Member] | July 25, 2016 Reverse Share Split [Member]
Organization [Line Items]
Execution Date (Prior to Opening of Trading)	Jul. 25, 2016
Date Trading Resumed at Post- Split Price	Jul. 25, 2016
Type of Split	1-for-5 reverse Share split