v2.4.0.8
Schedule of Investments - Futures Contracts Sold (Detail) (USD $)
 3 Months Ended
Mar. 31, 2014
Contract
ProShares Short VIX Short-Term Futures ETF [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) $ 8,083,199 [1]
ProShares Short VIX Short-Term Futures ETF [Member] | VIX Futures CBOE Expires April 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 7,213 [1]
Notional Amount at Value 109,276,950 [1]
Unrealized Appreciation (Depreciation) 5,042,999 [1]
ProShares Short VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, Expires May 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 6,554 [1]
Notional Amount at Value 103,880,900 [1]
Unrealized Appreciation (Depreciation) 3,040,200 [1]
ProShares UltraShort DJ-UBS Natural Gas [Member] | Natural Gas Nymex Expires May Two Thousand And Fourteen [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 3,365 [2]
Notional Amount at Value 147,084,150 [2]
Unrealized Appreciation (Depreciation) 4,479,320 [2]
ProShares UltraShort Gold [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) 8,531,762 [3]
ProShares UltraShort Gold [Member] | Gold Futures Comex Expires June Two Thousand And Fourteen [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 2 [4]
Notional Amount at Value 256,760 [4]
Unrealized Appreciation (Depreciation) 16,860 [4]
ProShares UltraShort Silver [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) 7,742,580 [5]
ProShares UltraShort Silver [Member] | Silver Futures Comex Expires May Two Thousand And Fourteen [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 2 [6]
Notional Amount at Value 197,520 [6]
Unrealized Appreciation (Depreciation) 5,330 [6]
ProShares Short Euro [Member] | Euro Fx Currency Futures CME Expires June 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 41 [7]
Notional Amount at Value 7,059,175 [7]
Unrealized Appreciation (Depreciation) 47,900 [7]
ProShares UltraShort Australian Dollar [Member] | Australian Dollar Fx Currency Futures CME expires June 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 459 [8]
Notional Amount at Value 42,342,750 [8]
Unrealized Appreciation (Depreciation) (1,221,879) [8]
ProShares UltraShort DJ-UBS Crude Oil [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) (692,931) [3]
ProShares UltraShort DJ-UBS Crude Oil [Member] | Crude Oil Nymex Expires May Two Thousand And Fourteen [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 2,752 [9]
Notional Amount at Value 279,548,160 [9]
Unrealized Appreciation (Depreciation) $ (6,264,314) [9]
[1] Cash collateral in the amount of $44,907,500 was pledged to cover margin requirements for open futures contracts as of March 31, 2014.
[2] Cash collateral in the amount of $11,104,500 was pledged to cover margin requirements for open futures contracts as of March 31, 2014.
[3] The positions and counterparties herein are as of March 31, 2014. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at anytime.
[4] Cash collateral in the amount of $15,950 was pledged to cover margin requirements for open futures contracts as of March 31, 2014.
[5] The positions and counterparties herein are as of March 31, 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 $22,000 was pledged to cover margin requirements for open futures contracts as of March 31, 2014.
[7] Cash collateral in the amount of $101,475 was pledged to cover margin requirements for open futures contracts as of March 31, 2014.
[8] Cash collateral in the amount of $934,065 was pledged to cover margin requirements for open futures contracts as of March 31, 2014.
[9] Cash collateral in the amount of $9,384,320 was pledged to cover margin requirements for open futures contracts as of March 31, 2014.