v2.4.0.6
Schedule of Investments (Futures Contracts Purchased) (Detail) (USD $)
Mar. 31, 2013
ProShares Ultra DJ-UBS Crude Oil [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) $ 25,193,571 [1]
ProShares Ultra DJ-UBS Crude Oil [Member] | Crude Oil - NYMEX, expires May 2013 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 2,810 [2]
Notional Amount at Value 273,216,300 [2]
Unrealized Appreciation (Depreciation) 1,362,516 [2]
ProShares Ultra DJ-UBS Natural Gas [Member] | Natural Gas - NYMEX, expires May 2013 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 2,548 [3]
Notional Amount at Value 102,531,520 [3]
Unrealized Appreciation (Depreciation) 14,044,618 [3]
ProShares Ultra Gold [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) 9,222,440 [1]
ProShares Ultra Gold [Member] | Gold Futures - COMEX, Expires June 2013 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 2 [4]
Notional Amount at Value 319,140 [4]
Unrealized Appreciation (Depreciation) 1,380 [4]
ProShares Ultra Silver [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) (8,106,718) [1]
ProShares Ultra Silver [Member] | Silver Futures - COMEX, expires May 2013 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 2 [5]
Notional Amount at Value 283,230 [5]
Unrealized Appreciation (Depreciation) (27,770) [5]
ProShares Ultra Australian Dollar [Member] | Australian Dollar Fx Currency Futures - CME, expires June 2013 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 81 [6]
Notional Amount at Value 8,385,930 [6]
Unrealized Appreciation (Depreciation) 124,930 [6]
ProShares VIX Short-Term Futures ETF [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) (8,346,060) [7]
ProShares VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, expires April 2013 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 9,424 [7]
Notional Amount at Value 133,820,800 [7]
Unrealized Appreciation (Depreciation) (7,254,355) [7]
ProShares VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, expires May 2013 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 5,483 [7]
Notional Amount at Value 85,534,800 [7]
Unrealized Appreciation (Depreciation) (1,091,705) [7]
ProShares VIX Mid-Term Futures ETF [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) (1,876,429) [8]
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures - CBOE, expires July 2013 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 793 [8]
Notional Amount at Value 13,758,550 [8]
Unrealized Appreciation (Depreciation) (580,020) [8]
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures - CBOE, expires August 2013 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 1,255 [8]
Notional Amount at Value 22,401,750 [8]
Unrealized Appreciation (Depreciation) (970,169) [8]
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures - CBOE, expires September 2013 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 1,256 [8]
Notional Amount at Value 23,173,200 [8]
Unrealized Appreciation (Depreciation) (300,190) [8]
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures - CBOE, expires October 2013 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 463 [8]
Notional Amount at Value 8,750,700 [8]
Unrealized Appreciation (Depreciation) (26,050) [8]
ProShares Ultra VIX Short-Term Futures ETF [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) (18,737,121) [9]
ProShares Ultra VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, expires April 2013 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 29,637 [9]
Notional Amount at Value 420,845,400 [9]
Unrealized Appreciation (Depreciation) (15,417,639) [9]
ProShares Ultra VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, expires May 2013 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 17,272 [9]
Notional Amount at Value 269,443,200 [9]
Unrealized Appreciation (Depreciation) $ (3,319,482) [9]
[1] The positions and counterparties herein are as of March 31, 2013. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.
[2] Cash collateral in the amount of $13,909,500 was pledged to cover margin requirements for open futures contracts as of March 31, 2013.
[3] Cash collateral in the amount of $5,885,880 was pledged to cover margin requirements for open futures contracts as of March 31, 2013.
[4] Cash collateral in the amount of $11,880 was pledged to cover margin requirements for open futures contracts as of March 31, 2013.
[5] Cash collateral in the amount of $20,900 was pledged to cover margin requirements for open futures contracts as of March 31, 2013.
[6] Cash collateral in the amount of $133,650 was pledged to cover margin requirements for open futures contracts as of March 31, 2013.
[7] Cash collateral in the amount of $67,081,496 was pledged to cover margin requirements for open futures contracts as of March 31, 2013.
[8] Cash collateral in the amount of $16,951,501 was pledged to cover margin requirements for open futures contracts as of March 31, 2013.
[9] Cash collateral in the amount of $211,090,492 was pledged to cover margin requirements for open futures contracts as of March 31, 2013.