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Investments - Effect of Derivative Instruments on Statements of Operations (Detail) (USD $)
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3 Months Ended | |
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Mar. 31, 2014
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Mar. 31, 2013
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Realized Gain or (Loss) on Derivatives Recognized in Income | $ 76,214,916 | $ (230,349,276) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | (53,072,999) | 86,306,510 |
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Commodity Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts, Swap and/ or Forward Agreements/ Changes in Unrealized Appreciation/ Depreciation on Futures Contracts, Swap and/ or Forward Agreements [Member] | ProShares UltraShort DJ-UBS Commodity [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Realized Gain or (Loss) on Derivatives Recognized in Income | (635,695) | 308,498 |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 129,934 | (241,421) |
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Commodity Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts, Swap and/ or Forward Agreements/ Changes in Unrealized Appreciation/ Depreciation on Futures Contracts, Swap and/ or Forward Agreements [Member] | ProShares UltraShort DJ-UBS Crude Oil [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Realized Gain or (Loss) on Derivatives Recognized in Income | (12,278,001) | (6,125,158) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | (3,391,572) | (1,500,109) |
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Commodity Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts, Swap and/ or Forward Agreements/ Changes in Unrealized Appreciation/ Depreciation on Futures Contracts, Swap and/ or Forward Agreements [Member] | ProShares UltraShort DJ-UBS Natural Gas [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Realized Gain or (Loss) on Derivatives Recognized in Income | (9,215,034) | (1,773,421) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 3,437,020 | (3,905,888) |
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Commodity Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts, Swap and/ or Forward Agreements/ Changes in Unrealized Appreciation/ Depreciation on Futures Contracts, Swap and/ or Forward Agreements [Member] | ProShares UltraShort Gold [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Realized Gain or (Loss) on Derivatives Recognized in Income | (22,149,687) | 12,883,467 |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 2,901,049 | (6,992,788) |
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Commodity Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts, Swap and/ or Forward Agreements/ Changes in Unrealized Appreciation/ Depreciation on Futures Contracts, Swap and/ or Forward Agreements [Member] | ProShares UltraShort Silver [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Realized Gain or (Loss) on Derivatives Recognized in Income | (12,614,405) | 29,204,512 |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 9,961,567 | (19,064,897) |
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Commodity Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts, Swap and/ or Forward Agreements/ Changes in Unrealized Appreciation/ Depreciation on Futures Contracts, Swap and/ or Forward Agreements [Member] | ProShares Ultra DJ-UBS Commodity [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Realized Gain or (Loss) on Derivatives Recognized in Income | 537,342 | (508,897) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | (129,206) | 421,315 |
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Commodity Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts, Swap and/ or Forward Agreements/ Changes in Unrealized Appreciation/ Depreciation on Futures Contracts, Swap and/ or Forward Agreements [Member] | ProShares Ultra DJ-UBS Crude Oil [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Realized Gain or (Loss) on Derivatives Recognized in Income | 21,193,668 | 66,564,325 |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 484,711 | (28,737,943) |
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Commodity Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts, Swap and/ or Forward Agreements/ Changes in Unrealized Appreciation/ Depreciation on Futures Contracts, Swap and/ or Forward Agreements [Member] | ProShares Ultra DJ-UBS Natural Gas [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Realized Gain or (Loss) on Derivatives Recognized in Income | 16,803,375 | 5,748,194 |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 1,805,128 | 17,861,568 |
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Commodity Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts, Swap and/ or Forward Agreements/ Changes in Unrealized Appreciation/ Depreciation on Futures Contracts, Swap and/ or Forward Agreements [Member] | ProShares Ultra Gold [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Realized Gain or (Loss) on Derivatives Recognized in Income | 23,433,620 | (50,415,205) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | (5,199,398) | 24,891,118 |
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Commodity Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts, Swap and/ or Forward Agreements/ Changes in Unrealized Appreciation/ Depreciation on Futures Contracts, Swap and/ or Forward Agreements [Member] | ProShares Ultra Silver [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Realized Gain or (Loss) on Derivatives Recognized in Income | 73,955,572 | (215,688,548) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | (55,636,611) | 137,646,238 |
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Foreign Exchange Contracts [Member] | Net Realized Gain (Loss) on Foreign Currency Forward Contracts/ Changes in Unrealized Appreciation/ Depreciation on Foreign Currency Forward Contracts [Member] | ProShares Short Euro [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Realized Gain or (Loss) on Derivatives Recognized in Income | (66,588) | (8,000) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 81,131 | 116,769 |
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Foreign Exchange Contracts [Member] | Net Realized Gain (Loss) on Foreign Currency Forward Contracts/ Changes in Unrealized Appreciation/ Depreciation on Foreign Currency Forward Contracts [Member] | ProShares UltraShort Australian Dollar [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Realized Gain or (Loss) on Derivatives Recognized in Income | (78,609) | 112,030 |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | (2,139,484) | (195,160) |
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Foreign Exchange Contracts [Member] | Net Realized Gain (Loss) on Foreign Currency Forward Contracts/ Changes in Unrealized Appreciation/ Depreciation on Foreign Currency Forward Contracts [Member] | ProShares UltraShort Euro [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Realized Gain or (Loss) on Derivatives Recognized in Income | (12,182,041) | (2,949,680) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 10,024,197 | 26,813,021 |
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Foreign Exchange Contracts [Member] | Net Realized Gain (Loss) on Foreign Currency Forward Contracts/ Changes in Unrealized Appreciation/ Depreciation on Foreign Currency Forward Contracts [Member] | ProShares UltraShort Yen [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Realized Gain or (Loss) on Derivatives Recognized in Income | (102,730) | 96,886,297 |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | (24,540,300) | (35,381,549) |
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Foreign Exchange Contracts [Member] | Net Realized Gain (Loss) on Foreign Currency Forward Contracts/ Changes in Unrealized Appreciation/ Depreciation on Foreign Currency Forward Contracts [Member] | ProShares Ultra Australian Dollar [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Realized Gain or (Loss) on Derivatives Recognized in Income | (27,427) | (149,275) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 311,205 | 223,960 |
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Foreign Exchange Contracts [Member] | Net Realized Gain (Loss) on Foreign Currency Forward Contracts/ Changes in Unrealized Appreciation/ Depreciation on Foreign Currency Forward Contracts [Member] | ProShares Ultra Euro [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Realized Gain or (Loss) on Derivatives Recognized in Income | 85,136 | (65,362) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | (79,978) | (221,155) |
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Foreign Exchange Contracts [Member] | Net Realized Gain (Loss) on Foreign Currency Forward Contracts/ Changes in Unrealized Appreciation/ Depreciation on Foreign Currency Forward Contracts [Member] | ProShares Ultra Yen [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Realized Gain or (Loss) on Derivatives Recognized in Income | (10,517) | (1,217,971) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 118,080 | 423,734 |
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VIX Futures Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts/ Changes in Unrealized Appreciation/ Depreciation on Futures Contracts [Member] | ProShares VIX Short-Term Futures ETF [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Realized Gain or (Loss) on Derivatives Recognized in Income | 15,779,707 | (55,408,949) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 11,625,721 | (8,124,641) |
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VIX Futures Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts/ Changes in Unrealized Appreciation/ Depreciation on Futures Contracts [Member] | ProShares VIX Mid-Term Futures ETF [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Realized Gain or (Loss) on Derivatives Recognized in Income | (5,397,902) | (10,260,171) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 2,889,479 | (406,019) |
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VIX Futures Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts/ Changes in Unrealized Appreciation/ Depreciation on Futures Contracts [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Realized Gain or (Loss) on Derivatives Recognized in Income | (3,546,304) | (122,690,073) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | (5,691,916) | (21,095,534) |
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VIX Futures Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts/ Changes in Unrealized Appreciation/ Depreciation on Futures Contracts [Member] | ProShares Short VIX Short-Term Futures ETF [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Realized Gain or (Loss) on Derivatives Recognized in Income | 2,731,436 | 25,204,111 |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | $ (33,756) | $ 3,775,891 |