|
Investments - Fair Value of Derivative Instruments (Detail) (USD $)
|
Mar. 31, 2014
|
Dec. 31, 2013
|
|---|---|---|
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | $ 38,486,246 | $ 49,932,144 |
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 122,164,235 | 80,537,134 |
|
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swap and/ or Forwards Agreements [Member] | ProShares UltraShort DJ-UBS Commodity [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 102,269 | |
|
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swap and/ or Forwards Agreements [Member] | ProShares UltraShort DJ-UBS Crude Oil [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 71,219 | |
|
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swap and/ or Forwards Agreements [Member] | ProShares UltraShort Gold [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 8,548,622 | 5,647,573 |
|
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swap and/ or Forwards Agreements [Member] | ProShares UltraShort Silver [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 7,747,910 | 14,200 |
|
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swap and/ or Forwards Agreements [Member] | ProShares Ultra DJ-UBS Commodity [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 15,078 | |
|
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swap and/ or Forwards Agreements [Member] | ProShares Ultra DJ-UBS Crude Oil [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 3,069,265 | 2,584,554 |
|
Commodity Contracts [Member] | Receivables on Open Futures Contracts, Unrealized Appreciation on Swap and/ or Forwards Agreements [Member] | ProShares UltraShort DJ-UBS Natural Gas [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 4,479,320 | 1,042,300 |
|
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares UltraShort DJ-UBS Commodity [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 114,128 | |
|
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares UltraShort DJ-UBS Crude Oil [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 7,028,464 | 3,565,673 |
|
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares Ultra DJ-UBS Natural Gas [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 3,656,539 | |
|
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares UltraShort Gold [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 12,026,932 | |
|
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares UltraShort Silver [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 58,143,691 | 2,227,857 |
|
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares Short Euro [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 1,851,411 | |
|
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares Ultra DJ-UBS Commodity [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 27,665 | |
|
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares Ultra Gold [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 6,827,534 | |
|
Commodity Contracts [Member] | Payable on Open Futures Contracts, Unrealized Depreciation on Swap and/or Forward Agreements [Member] | ProShares Ultra Silver [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 2,507,080 | |
|
Foreign Exchange Contracts [Member] | Unrealized Depreciation on Foreign Currency Forward Contracts and Payable on Open Futures Contracts [Member] | ProShares Short Euro [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 33,231 | |
|
Foreign Exchange Contracts [Member] | Unrealized Depreciation on Foreign Currency Forward Contracts and Payable on Open Futures Contracts [Member] | ProShares UltraShort Australian Dollar [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 1,221,879 | |
|
Foreign Exchange Contracts [Member] | Unrealized Depreciation on Foreign Currency Forward Contracts and Payable on Open Futures Contracts [Member] | ProShares UltraShort Euro [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 3,724,310 | 13,899,858 |
|
Foreign Exchange Contracts [Member] | Unrealized Depreciation on Foreign Currency Forward Contracts and Payable on Open Futures Contracts [Member] | ProShares UltraShort Yen [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 1,275,150 | 1,930,884 |
|
Foreign Exchange Contracts [Member] | Unrealized Depreciation on Foreign Currency Forward Contracts and Payable on Open Futures Contracts [Member] | ProShares Ultra Australian Dollar [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 118,220 | |
|
Foreign Exchange Contracts [Member] | Unrealized Depreciation on Foreign Currency Forward Contracts and Payable on Open Futures Contracts [Member] | ProShares Ultra Euro [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 35 | 19,946 |
|
Foreign Exchange Contracts [Member] | Unrealized Depreciation on Foreign Currency Forward Contracts and Payable on Open Futures Contracts [Member] | ProShares Ultra Yen [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 42,233 | 163,361 |
|
Foreign Exchange Contracts [Member] | Unrealized Appreciation on Foreign Currency Forward Contracts and Receivables on Open Futures Contracts [Member] | ProShares UltraShort Australian Dollar [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 192,985 | 917,605 |
|
Foreign Exchange Contracts [Member] | Unrealized Appreciation on Foreign Currency Forward Contracts and Receivables on Open Futures Contracts [Member] | ProShares UltraShort Euro [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 47,900 | 151,351 |
|
Foreign Exchange Contracts [Member] | Unrealized Appreciation on Foreign Currency Forward Contracts and Receivables on Open Futures Contracts [Member] | ProShares UltraShort Yen [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 6,121,534 | 31,317,568 |
|
Foreign Exchange Contracts [Member] | Unrealized Appreciation on Foreign Currency Forward Contracts and Receivables on Open Futures Contracts [Member] | ProShares Ultra Euro [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 21,019 | 120,908 |
|
Foreign Exchange Contracts [Member] | Unrealized Appreciation on Foreign Currency Forward Contracts and Receivables on Open Futures Contracts [Member] | ProShares Ultra Yen [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 1,004 | 4,052 |
|
VIX Futures Contracts [Member] | Receivables on Open Futures Contracts and Unrealized Appreciation on Swap Agreements [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative asset not designated as hedging instrument, Unrealized Appreciation | 8,083,199 | 8,116,955 |
|
VIX Futures Contracts [Member] | Payable on Open Futures Contracts and Unrealized Depreciation on Swap Agreements [Member] | ProShares VIX Short-Term Futures ETF [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 5,026,965 | 16,652,686 |
|
VIX Futures Contracts [Member] | Payable on Open Futures Contracts and Unrealized Depreciation on Swap Agreements [Member] | ProShares VIX Mid-Term Futures ETF [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 2,007,210 | 4,896,689 |
|
VIX Futures Contracts [Member] | Payable on Open Futures Contracts and Unrealized Depreciation on Swap Agreements [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | 29,701,827 | |
|
VIX Futures Contracts [Member] | Payable on Open Futures Contracts and Unrealized Depreciation on Swap Agreements [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
|
||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liability not designated as hedging instrument, Unrealized Depreciation | $ 24,009,911 |