v2.4.0.8
Schedule of Investments - Swap Agreements (Detail) (USD $)
 6 Months Ended
Jun. 30, 2014
ProShares UltraShort Bloomberg Commodity [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) $ (49,719) [1]
ProShares UltraShort Bloomberg Commodity [Member] | Swap Agreement with Deutsche Bank AG Based on Bloomberg Commodity Index [Member]
  
Schedule of Investments [Line Items]  
Rate Paid (Received) 0.25% [1]
Termination Date Jul. 07, 2014 [1]
Notional Amount at Value (2,595,868) [1],[2]
Unrealized Appreciation (Depreciation) (20,115) [1]
ProShares UltraShort Bloomberg Commodity [Member] | Swap Agreement with Goldman Sachs International Based on Bloomberg Commodity Index [Member]
  
Schedule of Investments [Line Items]  
Rate Paid (Received) 0.25% [1]
Termination Date Jul. 07, 2014 [1]
Notional Amount at Value (2,767,667) [1],[2]
Unrealized Appreciation (Depreciation) (17,081) [1]
ProShares UltraShort Bloomberg Commodity [Member] | Swap Agreement with UBS AG Based on Bloomberg Commodity Index [Member]
  
Schedule of Investments [Line Items]  
Rate Paid (Received) 0.60% [1]
Termination Date Jul. 07, 2014 [1]
Notional Amount at Value (1,138,280) [1],[2]
Unrealized Appreciation (Depreciation) (12,523) [1]
ProShares UltraShort Bloomberg Crude Oil [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) (16,105,152) [1]
ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreement with Deutsche Bank AG Based on Bloomberg WTI Crude Oil Subindex [Member]
  
Schedule of Investments [Line Items]  
Rate Paid (Received) 0.25% [1]
Termination Date Jul. 07, 2014 [1]
Notional Amount at Value (116,423,779) [1],[2]
Unrealized Appreciation (Depreciation) (4,518,754) [1]
ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreement with Goldman Sachs International Based on Bloomberg WTI Crude Oil Subindex [Member]
  
Schedule of Investments [Line Items]  
Rate Paid (Received) 0.25% [1]
Termination Date Jul. 07, 2014 [1]
Notional Amount at Value (127,285,152) [1],[2]
Unrealized Appreciation (Depreciation) (4,396,306) [1]
ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreement with Societe Generale S.A. Based on Bloomberg WTI Crude Oil Subindex [Member]
  
Schedule of Investments [Line Items]  
Rate Paid (Received) 0.25% [1]
Termination Date Jul. 07, 2014 [1]
Notional Amount at Value (59,190,848) [1],[2]
Unrealized Appreciation (Depreciation) (2,715,109) [1]
ProShares UltraShort Bloomberg Crude Oil [Member] | Swap Agreement with UBS AG Based on Bloomberg WTI Crude Oil Subindex [Member]
  
Schedule of Investments [Line Items]  
Rate Paid (Received) 0.25% [1]
Termination Date Jul. 07, 2014 [1]
Notional Amount at Value (116,599,880) [1],[2]
Unrealized Appreciation (Depreciation) (4,474,983) [1]
ProShares Ultra Bloomberg Commodity [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) 9,044 [1]
ProShares Ultra Bloomberg Commodity [Member] | Swap Agreement with Deutsche Bank AG Based on Bloomberg Commodity Index [Member]
  
Schedule of Investments [Line Items]  
Rate Paid (Received) 0.25% [1]
Termination Date Jul. 07, 2014 [1]
Notional Amount at Value 3,598,575 [1],[2]
Unrealized Appreciation (Depreciation) 7,260 [1]
ProShares Ultra Bloomberg Commodity [Member] | Swap Agreement with Goldman Sachs International Based on Bloomberg Commodity Index [Member]
  
Schedule of Investments [Line Items]  
Rate Paid (Received) 0.25% [1]
Termination Date Jul. 07, 2014 [1]
Notional Amount at Value 3,955,878 [1],[2]
Unrealized Appreciation (Depreciation) (5,077) [1]
ProShares Ultra Bloomberg Commodity [Member] | Swap Agreement with UBS AG Based on Bloomberg Commodity Index [Member]
  
Schedule of Investments [Line Items]  
Rate Paid (Received) 0.60% [1]
Termination Date Jul. 07, 2014 [1]
Notional Amount at Value 1,276,872 [1],[2]
Unrealized Appreciation (Depreciation) 6,861 [1]
ProShares Ultra Bloomberg Crude Oil [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) 4,111,030 [3]
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreement with Deutsche Bank AG Based on Bloomberg WTI Crude Oil Subindex [Member]
  
Schedule of Investments [Line Items]  
Rate Paid (Received) 0.25% [3]
Termination Date Jul. 07, 2014 [3]
Notional Amount at Value 31,823,119 [2],[3]
Unrealized Appreciation (Depreciation) 1,035,637 [3]
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreement with Goldman Sachs International Based on Bloomberg WTI Crude Oil Subindex [Member]
  
Schedule of Investments [Line Items]  
Rate Paid (Received) 0.25% [3]
Termination Date Jul. 07, 2014 [3]
Notional Amount at Value 27,268,424 [2],[3]
Unrealized Appreciation (Depreciation) 1,328,164 [3]
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreement with Societe Generale S.A. Based on Bloomberg WTI Crude Oil Subindex [Member]
  
Schedule of Investments [Line Items]  
Rate Paid (Received) 0.25% [3]
Termination Date Jul. 07, 2014 [3]
Notional Amount at Value 17,530,561 [2],[3]
Unrealized Appreciation (Depreciation) 629,911 [3]
ProShares Ultra Bloomberg Crude Oil [Member] | Swap Agreement with UBS AG Based on Bloomberg WTI Crude Oil Subindex [Member]
  
Schedule of Investments [Line Items]  
Rate Paid (Received) 0.25% [3]
Termination Date Jul. 07, 2014 [3]
Notional Amount at Value 31,095,182 [2],[3]
Unrealized Appreciation (Depreciation) $ 1,117,318 [3]
[1] The positions and counterparties herein are as of June 30, 2014. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at anytime.
[2] For swap agreements, a positive amount represents "long" exposure to the benchmark index. A negative amount represents "short" exposure to the benchmark index.
[3] The positions and counterparties herein are as of June 30, 2014. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.