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Creation and Redemption of Creation Units (Schedule of Transaction Fees) (Detail) (USD $)
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3 Months Ended |
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Mar. 31, 2013
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ProShares UltraShort DJ-UBS Commodity [Member]
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| Creation And Redemption Of Creation Units [Line Items] |
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| Transaction fees |
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ProShares UltraShort DJ-UBS Crude Oil [Member]
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| Creation And Redemption Of Creation Units [Line Items] |
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| Transaction fees |
25,356 |
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ProShares UltraShort DJ-UBS Natural Gas [Member]
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| Creation And Redemption Of Creation Units [Line Items] |
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| Transaction fees |
2,081 |
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ProShares UltraShort Gold [Member]
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| Creation And Redemption Of Creation Units [Line Items] |
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| Transaction fees |
5,859 |
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ProShares UltraShort Silver [Member]
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| Creation And Redemption Of Creation Units [Line Items] |
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| Transaction fees |
13,038 |
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ProShares Short Euro [Member]
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| Creation And Redemption Of Creation Units [Line Items] |
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| Transaction fees |
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ProShares UltraShort Australian Dollar [Member]
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| Creation And Redemption Of Creation Units [Line Items] |
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| Transaction fees |
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ProShares UltraShort Euro [Member]
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| Creation And Redemption Of Creation Units [Line Items] |
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| Transaction fees |
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ProShares UltraShort Yen [Member]
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| Creation And Redemption Of Creation Units [Line Items] |
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| Transaction fees |
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ProShares Ultra DJ-UBS Commodity [Member]
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| Creation And Redemption Of Creation Units [Line Items] |
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| Transaction fees |
283 |
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ProShares Ultra DJ-UBS Crude Oil [Member]
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| Creation And Redemption Of Creation Units [Line Items] |
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| Transaction fees |
53,244 |
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ProShares Ultra DJ-UBS Natural Gas [Member]
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| Creation And Redemption Of Creation Units [Line Items] |
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| Transaction fees |
11,710 |
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ProShares Ultra Gold [Member]
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| Creation And Redemption Of Creation Units [Line Items] |
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| Transaction fees |
1,715 |
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ProShares Ultra Silver [Member]
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| Creation And Redemption Of Creation Units [Line Items] |
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| Transaction fees |
20,251 |
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ProShares Ultra Australian Dollar [Member]
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| Creation And Redemption Of Creation Units [Line Items] |
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| Transaction fees |
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ProShares Ultra Euro [Member]
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| Creation And Redemption Of Creation Units [Line Items] |
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| Transaction fees |
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ProShares Ultra Yen [Member]
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| Creation And Redemption Of Creation Units [Line Items] |
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| Transaction fees |
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ProShares VIX Short-Term Futures ETF [Member]
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| Creation And Redemption Of Creation Units [Line Items] |
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| Transaction fees |
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ProShares VIX Mid-Term Futures ETF [Member]
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| Creation And Redemption Of Creation Units [Line Items] |
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| Transaction fees |
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ProShares Ultra VIX Short-Term Futures ETF [Member]
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| Creation And Redemption Of Creation Units [Line Items] |
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| Transaction fees |
213,290 |
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ProShares Short VIX Short-Term Futures ETF [Member]
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| Creation And Redemption Of Creation Units [Line Items] |
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| Transaction fees |
32,376 |
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Total Trust [Member]
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| Creation And Redemption Of Creation Units [Line Items] |
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| Transaction fees |
$ 379,203 |