v2.4.0.8
Schedule of Investments - Futures Contracts Sold (Detail) (USD $)
 6 Months Ended
Jun. 30, 2014
Contract
ProShares UltraShort Bloomberg Crude Oil [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) $ (16,105,152) [1]
ProShares UltraShort Bloomberg Crude Oil [Member] | Crude Oil - NYMEX, Expires September 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 2,920 [2]
Notional Amount at Value 305,811,600 [2]
Unrealized Appreciation (Depreciation) (5,168,641) [2]
ProShares UltraShort Bloomberg Natural Gas [Member] | Natural Gas - NYMEX, Expires September 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 2,238 [3]
Notional Amount at Value 99,367,200 [3]
Unrealized Appreciation (Depreciation) 2,467,844 [3]
ProShares UltraShort Gold [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) (10,583,508) [1]
ProShares UltraShort Gold [Member] | Gold Futures-COMEX, Expires August 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 2 [4]
Notional Amount at Value 264,400 [4]
Unrealized Appreciation (Depreciation) (4,840) [4]
ProShares UltraShort Silver [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) (10,563,213) [5]
ProShares UltraShort Silver [Member] | Silver Futures-COMEX, Expires September 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 2 [6]
Notional Amount at Value 210,560 [6]
Unrealized Appreciation (Depreciation) (16,910) [6]
ProShares Short Euro [Member] | Euro Fx Currency Futures-CME, Expires September 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 83 [7]
Notional Amount at Value 14,211,675 [7]
Unrealized Appreciation (Depreciation) (111,159) [7]
ProShares UltraShort Australian Dollar [Member] | Australian Dollar Fx Currency Futures-CME, Expires September 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 429 [8]
Notional Amount at Value 40,223,040 [8]
Unrealized Appreciation (Depreciation) (362,840) [8]
ProShares Short VIX Short-Term Futures ETF [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) 8,920,627 [9]
ProShares Short VIX Short-Term Futures ETF [Member] | VIX Futures-CBOE, Expires July 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 7,404 [9]
Notional Amount at Value 92,179,800 [9]
Unrealized Appreciation (Depreciation) 6,750,327 [9]
ProShares Short VIX Short-Term Futures ETF [Member] | VIX Futures-CBOE, Expires August 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 6,657 [9]
Notional Amount at Value 88,870,950 [9]
Unrealized Appreciation (Depreciation) $ 2,170,300 [9]
[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] Cash collateral in the amount of $9,154,200 was pledged to cover margin requirements for open futures contracts as of June 30, 2014.
[3] Cash collateral in the amount of $6,400,680 was pledged to cover margin requirements for open futures contracts as of June 30, 2014.
[4] Cash collateral in the amount of $13,200 was pledged to cover margin requirements for open futures contracts as of June 30, 2014.
[5] 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.
[6] Cash collateral in the amount of $18,150 was pledged to cover margin requirements for open futures contracts as of June 30, 2014.
[7] Cash collateral in the amount of $182,600 was pledged to cover margin requirements for open futures contracts as of June 30, 2014.
[8] Cash collateral in the amount of $707,850 was pledged to cover margin requirements for open futures contracts as of June 30, 2014.
[9] Cash collateral in the amount of $38,188,800 was pledged to cover margin requirements for open futures contracts as of June 30, 2014.