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Investments - Effect of Derivative Instruments on Statements of Operations (Detail) (USD $)
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3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Realized Gain or (Loss) on Derivatives Recognized in Income | $ (341,755,684) | $ (225,181,050) | $ (265,540,768) | $ (455,530,326) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 90,346,405 | (140,296,240) | 37,273,406 | (53,989,730) |
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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 Bloomberg Commodity [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Realized Gain or (Loss) on Derivatives Recognized in Income | 130,061 | 150,169 | (505,634) | 458,667 |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | (151,988) | 505,167 | (22,054) | 263,746 |
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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 Bloomberg Crude Oil [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Realized Gain or (Loss) on Derivatives Recognized in Income | (31,567,008) | 1,025,654 | (43,845,009) | (5,099,504) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | (14,316,548) | 9,878,372 | (17,708,120) | 8,378,263 |
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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 Bloomberg Natural Gas [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Realized Gain or (Loss) on Derivatives Recognized in Income | (1,970,509) | (834,719) | (11,185,543) | (2,608,140) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | (2,011,476) | 5,826,227 | 1,425,544 | 1,920,339 |
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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 | 13,875,395 | 20,858,050 | (8,274,292) | 33,741,517 |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | (19,136,970) | 55,074,622 | (16,235,921) | 48,081,834 |
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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 | 12,455,116 | 51,615,327 | (159,289) | 80,819,839 |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | (18,328,033) | 40,886,777 | (8,366,466) | 21,821,880 |
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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 Bloomberg Commodity [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Realized Gain or (Loss) on Derivatives Recognized in Income | (160,396) | (274,078) | 376,946 | (782,975) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 123,172 | (586,322) | (6,034) | (165,007) |
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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 Bloomberg Crude Oil [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Realized Gain or (Loss) on Derivatives Recognized in Income | 9,814,101 | 20,733,669 | 31,007,769 | 87,297,994 |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 2,164,869 | (22,057,265) | 2,649,580 | (50,795,208) |
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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 Bloomberg Natural Gas [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Realized Gain or (Loss) on Derivatives Recognized in Income | 162,451 | 9,153,747 | 16,965,826 | 14,901,941 |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 440,646 | (19,990,856) | 2,245,774 | (2,129,288) |
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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 | (21,489,136) | (68,008,649) | 1,944,484 | (118,423,854) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 25,259,667 | (62,970,484) | 20,060,269 | (38,079,366) |
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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 | (106,239,950) | (322,610,723) | (32,284,378) | (538,299,271) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 145,054,357 | (168,439,871) | 89,417,746 | (30,793,633) |
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Foreign Exchange Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts and/or Foreign Currency Forward Contracts/Changes in Unrealized Appreciation/ Depreciation on Futures Contracts and/or 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 | 225,122 | (67,938) | 158,534 | (75,938) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | (159,059) | 5,900 | (77,928) | 122,669 |
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Foreign Exchange Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts and/or Foreign Currency Forward Contracts/Changes in Unrealized Appreciation/ Depreciation on Futures Contracts and/or 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 | (1,846,929) | 1,793,067 | (1,925,538) | 1,905,097 |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 859,039 | 1,508,211 | (1,280,445) | 1,313,051 |
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Foreign Exchange Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts and/or Foreign Currency Forward Contracts/Changes in Unrealized Appreciation/ Depreciation on Futures Contracts and/or 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 | 5,886,956 | (8,147,050) | (6,295,085) | (11,096,730) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | (1,863,031) | (8,918,725) | 8,161,166 | 17,894,296 |
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Foreign Exchange Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts and/or Foreign Currency Forward Contracts/Changes in Unrealized Appreciation/ Depreciation on Futures Contracts and/or 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 | 268,536 | 48,138,405 | 165,806 | 145,024,702 |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | (14,493,994) | (6,860,712) | (39,034,294) | (42,242,261) |
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Foreign Exchange Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts and/or Foreign Currency Forward Contracts/Changes in Unrealized Appreciation/ Depreciation on Futures Contracts and/or 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 | 285,670 | (590,630) | 258,243 | (739,905) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | (129,485) | (332,037) | 181,720 | (108,077) |
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Foreign Exchange Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts and/or Foreign Currency Forward Contracts/Changes in Unrealized Appreciation/ Depreciation on Futures Contracts and/or 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 | (40,251) | 36,991 | 44,885 | (28,371) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 9,743 | 96,965 | (70,235) | (124,190) |
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Foreign Exchange Contracts [Member] | Net Realized Gain (Loss) on Futures Contracts and/or Foreign Currency Forward Contracts/Changes in Unrealized Appreciation/ Depreciation on Futures Contracts and/or 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 | (11,079) | (456,601) | (21,596) | (1,674,572) |
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 93,948 | 80,626 | 212,028 | 504,360 |
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VIX Futures Contracts [Member] | Net Realized Gain Loss On Futures Contracts And Swap Agreements Changes In Unrealized Appreciation Depreciation On Futures Contracts And Swap Agreements [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 | 11,156,344 | (44,252,605) | ||
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 9,582,597 | 1,457,956 | ||
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VIX Futures Contracts [Member] | Net Realized Gain Loss On Futures Contracts And Swap Agreements Changes In Unrealized Appreciation Depreciation On Futures Contracts And Swap Agreements [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 | (2,486,914) | (12,747,085) | ||
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 7,458,863 | 7,052,844 | ||
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VIX Futures Contracts [Member] | Net Realized Gain Loss On Futures Contracts And Swap Agreements Changes In Unrealized Appreciation Depreciation On Futures Contracts And Swap Agreements [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 | 17,763,794 | (104,926,279) | ||
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | 21,978,092 | 882,558 | ||
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VIX Futures Contracts [Member] | Net Realized Gain Loss On Futures Contracts And Swap Agreements Changes In Unrealized Appreciation Depreciation On Futures Contracts And Swap Agreements [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 | (4,128,965) | 21,075,146 | ||
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | (3,022,387) | 753,504 | ||
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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 | (41,227,047) | (25,447,340) | ||
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | (1,586,521) | 10,039,200 | ||
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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 | (6,666,419) | (12,064,321) | ||
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | (1,487,840) | 1,401,639 | ||
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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 | (247,176,983) | (250,723,287) | ||
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | (10,831,519) | (16,523,435) | ||
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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 | 73,536,615 | 76,268,051 | ||
| Change in Unrealized Appreciation or Depreciation on Derivatives Recognized in Income | $ 837,428 | $ 803,672 | ||