v2.4.0.8
Schedule of Investments - Future Contracts Purchased (Detail) (USD $)
 3 Months Ended
Mar. 31, 2014
Contract
ProShares Ultra DJ-UBS Crude Oil [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) $ 959,951 [1]
ProShares Ultra DJ-UBS Crude Oil [Member] | Crude Oil Nymex Expires May Two Thousand And Fourteen [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 858 [2]
Notional Amount at Value 87,155,640 [2]
Unrealized Appreciation (Depreciation) 2,109,314 [2]
ProShares Ultra DJ-UBS Natural Gas [Member] | Natural Gas Nymex Expires May Two Thousand And Fourteen [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 971 [3]
Notional Amount at Value 42,442,410 [3]
Unrealized Appreciation (Depreciation) (1,851,411) [3]
ProShares Ultra Gold [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) (12,010,072) [4]
ProShares Ultra Gold [Member] | Gold Futures Comex Expires June Two Thousand And Fourteen [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 2 [5]
Notional Amount at Value 256,760 [5]
Unrealized Appreciation (Depreciation) (16,860) [5]
ProShares Ultra Silver [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) (58,138,361) [1]
ProShares Ultra 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 Ultra Australian Dollar [Member] | Australian Dollar Fx Currency Futures CME expires June 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 75 [7]
Notional Amount at Value 6,918,750 [7]
Unrealized Appreciation (Depreciation) 192,985 [7]
ProShares VIX Short-Term Futures ETF [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) (5,026,965) [8]
ProShares VIX Short-Term Futures ETF [Member] | VIX Futures CBOE Expires April 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 3,998 [8]
Notional Amount at Value 60,569,700 [8]
Unrealized Appreciation (Depreciation) (3,342,385) [8]
ProShares VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, Expires May 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 3,632 [8]
Notional Amount at Value 57,567,200 [8]
Unrealized Appreciation (Depreciation) (1,684,580) [8]
ProShares VIX Mid-Term Futures ETF [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) (2,007,210) [9]
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures - CBOE, Expires July 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 576 [9]
Notional Amount at Value 9,763,200 [9]
Unrealized Appreciation (Depreciation) (439,150) [9]
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures CBOE Expires August 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 1,099 [9]
Notional Amount at Value 19,067,650 [9]
Unrealized Appreciation (Depreciation) (953,310) [9]
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures CBOE Expires September 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 1,099 [9]
Notional Amount at Value 19,507,250 [9]
Unrealized Appreciation (Depreciation) (494,910) [9]
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures CBOE Expires October 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 524 [9]
Notional Amount at Value 9,458,200 [9]
Unrealized Appreciation (Depreciation) (119,840) [9]
ProShares Ultra VIX Short-Term Futures ETF [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) (29,701,827) [10]
ProShares Ultra VIX Short-Term Futures ETF [Member] | VIX Futures CBOE Expires April 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 21,528 [10]
Notional Amount at Value 326,149,200 [10]
Unrealized Appreciation (Depreciation) (21,010,956) [10]
ProShares Ultra VIX Short-Term Futures ETF [Member] | VIX Futures - CBOE, Expires May 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 19,566 [10]
Notional Amount at Value 310,121,100 [10]
Unrealized Appreciation (Depreciation) $ (8,690,871) [10]
[1] 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.
[2] Cash collateral in the amount of $2,925,780 was pledged to cover margin requirements for open futures contracts as of March 31, 2014.
[3] Cash collateral in the amount of $3,204,300 was pledged to cover margin requirements for open futures contracts as of March 31, 2014.
[4] 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.
[5] Cash collateral in the amount of $15,950 was pledged to cover margin requirements for open futures contracts as of March 31, 2014.
[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 $152,625 was pledged to cover margin requirements for open futures contracts as of March 31, 2014.
[8] Cash collateral in the amount of $24,889,000 was pledged to cover margin requirements for open futures contracts as of March 31, 2014.
[9] Cash collateral in the amount of $9,129,600 was pledged to cover margin requirements for open futures contracts as of March 31, 2014.
[10] Cash collateral in the amount of $134,046,000 was pledged to cover margin requirements for open futures contracts as of March 31, 2014.