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Organization (Schedule of Share Splits and Reverse Share Splits) (Detail)
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1 Months Ended | ||||||||||||
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Feb. 25, 2011
ProShares UltraShort DJ-UBS Commodity [Member]
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Feb. 25, 2011
ProShares UltraShort DJ-UBS Crude Oil [Member]
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May 11, 2012
ProShares UltraShort DJ-UBS Natural Gas [Member]
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Oct. 05, 2012
ProShares UltraShort Gold [Member]
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May 11, 2012
ProShares UltraShort Silver [Member]
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Feb. 25, 2011
ProShares UltraShort Silver [Member]
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Oct. 13, 2011
ProShares UltraShort Yen [Member]
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Feb. 25, 2011
ProShares Ultra DJ-UBS Crude Oil [Member]
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May 11, 2012
ProShares Ultra DJ-UBS Natural Gas [Member]
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Oct. 13, 2011
ProShares Ultra Silver [Member]
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Sep. 07, 2012
ProShares Ultra VIX Short-Term Futures ETF [Member]
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Mar. 08, 2012
ProShares Ultra VIX Short-Term Futures ETF [Member]
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Oct. 05, 2012
ProShares Short VIX Short-Term Futures ETF [Member]
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| Organization [Line Items] | |||||||||||||
| Funds Reverse Split | 1-for-5 reverse Share split | 1-for-5 reverse Share split | 1-for-4 reverse Share split | 1-for-5 reverse Share split | 1-for-4 reverse Share split | 1-for-3 reverse Share split | 1-for-4 reverse Share split | 1-for-5 reverse Share split | 1-for-10 reverse Share split | 1-for-6 reverse Share split | |||
| Funds Split | 3-for-1 Share split | 2-for-1 Share split | 2-for-1 Share split | ||||||||||
| Execution date prior to opening of trading | February 25, 2011 | February 25, 2011 | May 11, 2012 | October 5, 2012 | May 11, 2012 | February 25, 2011 | October 13, 2011 | February 25, 2011 | May 11, 2012 | October 13, 2011 | September 7, 2012 | March 8, 2012 | October 5, 2012 |
| Trading date resumed at post- split price | February 25, 2011 | February 25, 2011 | May 11, 2012 | October 5, 2012 | May 11, 2012 | February 25, 2011 | October 13, 2011 | February 25, 2011 | May 11, 2012 | October 13, 2011 | September 7, 2012 | March 8, 2012 | October 5, 2012 |