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Investments - Fair Value of Derivative Instruments (Detail) (USD $)
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Jun. 30, 2014
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Dec. 31, 2013
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | $ 117,759,823 | $ 49,932,144 |
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 111,091,407 | 80,537,134 |
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Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares UltraShort Bloomberg Commodity [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 49,719 | 27,665 |
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Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares UltraShort Bloomberg Crude Oil [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 21,273,793 | 3,565,673 |
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Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares UltraShort Silver [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 10,580,123 | 2,227,857 |
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Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares Ultra Bloomberg Natural Gas [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 1,410,765 | 3,656,539 |
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Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares Ultra Gold [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 6,827,534 | |
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Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares Ultra Silver [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 2,507,080 | |
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Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares UltraShort Gold [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 10,588,348 | |
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Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares Ultra Bloomberg Commodity [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 5,077 | |
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Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swap and/ or Forwards Agreements [Member] | ProShares UltraShort Silver [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 14,200 | |
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Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swap and/ or Forwards Agreements [Member] | ProShares Ultra Gold [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 13,232,735 | |
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Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swap and/ or Forwards Agreements [Member] | ProShares Ultra Silver [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 86,910,666 | |
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Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swap and/ or Forwards Agreements [Member] | ProShares UltraShort Gold [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 5,647,573 | |
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Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swap and/ or Forwards Agreements [Member] | ProShares Ultra Bloomberg Commodity [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 14,121 | 15,078 |
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Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swap and/ or Forwards Agreements [Member] | ProShares UltraShort Bloomberg Natural Gas [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 2,467,844 | 1,042,300 |
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Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swap and/ or Forwards Agreements [Member] | ProShares Ultra Bloomberg Crude Oil [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 5,234,134 | 2,584,554 |
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Foreign Exchange Contracts [Member] | Unrealized Depreciation on Foreign Currency Forward Contracts and Payable on Open Futures Contracts [Member] | ProShares Short Euro [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 111,159 | 33,231 |
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Foreign Exchange Contracts [Member] | Unrealized Depreciation on Foreign Currency Forward Contracts and Payable on Open Futures Contracts [Member] | ProShares UltraShort Euro [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 5,915,312 | 13,899,858 |
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Foreign Exchange Contracts [Member] | Unrealized Depreciation on Foreign Currency Forward Contracts and Payable on Open Futures Contracts [Member] | ProShares UltraShort Yen [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 10,127,815 | 1,930,884 |
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Foreign Exchange Contracts [Member] | Unrealized Depreciation on Foreign Currency Forward Contracts and Payable on Open Futures Contracts [Member] | ProShares Ultra Australian Dollar [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 118,220 | |
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Foreign Exchange Contracts [Member] | Unrealized Depreciation on Foreign Currency Forward Contracts and Payable on Open Futures Contracts [Member] | ProShares Ultra Euro [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 378 | 19,946 |
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Foreign Exchange Contracts [Member] | Unrealized Depreciation on Foreign Currency Forward Contracts and Payable on Open Futures Contracts [Member] | ProShares Ultra Yen [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 24,196 | 163,361 |
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Foreign Exchange Contracts [Member] | Unrealized Depreciation on Foreign Currency Forward Contracts and Payable on Open Futures Contracts [Member] | ProShares UltraShort Australian Dollar [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 362,840 | |
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Foreign Exchange Contracts [Member] | Unrealized Appreciation on Foreign Currency Forward Contracts and Receivables on Open Futures Contracts [Member] | ProShares UltraShort Euro [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 327,971 | 151,351 |
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Foreign Exchange Contracts [Member] | Unrealized Appreciation on Foreign Currency Forward Contracts and Receivables on Open Futures Contracts [Member] | ProShares UltraShort Yen [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 480,205 | 31,317,568 |
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Foreign Exchange Contracts [Member] | Unrealized Appreciation on Foreign Currency Forward Contracts and Receivables on Open Futures Contracts [Member] | ProShares Ultra Australian Dollar [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 63,500 | |
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Foreign Exchange Contracts [Member] | Unrealized Appreciation on Foreign Currency Forward Contracts and Receivables on Open Futures Contracts [Member] | ProShares Ultra Euro [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 31,105 | 120,908 |
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Foreign Exchange Contracts [Member] | Unrealized Appreciation on Foreign Currency Forward Contracts and Receivables on Open Futures Contracts [Member] | ProShares Ultra Yen [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 76,915 | 4,052 |
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Foreign Exchange Contracts [Member] | Unrealized Appreciation on Foreign Currency Forward Contracts and Receivables on Open Futures Contracts [Member] | ProShares UltraShort Australian Dollar [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 917,605 | |
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VIX Futures Contracts [Member] | Payable on Open Futures Contracts and Unrealized Depreciation on Swap Agreements [Member] | ProShares VIX Short-Term Futures ETF [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 6,613,486 | 16,652,686 |
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VIX Futures Contracts [Member] | Payable on Open Futures Contracts and Unrealized Depreciation on Swap Agreements [Member] | ProShares VIX Mid-Term Futures ETF [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 3,495,050 | 4,896,689 |
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VIX Futures Contracts [Member] | Payable on Open Futures Contracts and Unrealized Depreciation on Swap Agreements [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 40,533,346 | 24,009,911 |
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VIX Futures Contracts [Member] | Receivables on Open Futures Contracts and Unrealized Appreciation on Swap Agreements [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | $ 8,920,627 | $ 8,116,955 |