v2.4.0.8
Schedule of Investments - Futures Contracts Purchased (Detail) (USD $)
 6 Months Ended
Jun. 30, 2014
Contract
ProShares Ultra Bloomberg Crude Oil [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) $ 4,111,030 [1]
ProShares Ultra Bloomberg Crude Oil [Member] | Crude Oil - NYMEX, Expires September 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 842 [2]
Notional Amount at Value 88,182,660 [2]
Unrealized Appreciation (Depreciation) 1,123,104 [2]
ProShares Ultra Bloomberg Natural Gas [Member] | Natural Gas - NYMEX, Expires September 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 953 [3]
Notional Amount at Value 42,313,200 [3]
Unrealized Appreciation (Depreciation) (1,410,765) [3]
ProShares Ultra Gold [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) 13,227,915 [4]
ProShares Ultra Gold [Member] | Gold Futures-COMEX, Expires August 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 2 [5]
Notional Amount at Value 264,400 [5]
Unrealized Appreciation (Depreciation) 4,820 [5]
ProShares Ultra Silver [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) 86,902,211 [1]
ProShares Ultra Silver [Member] | Silver Futures-COMEX, Expires September 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 1 [6]
Notional Amount at Value 105,280 [6]
Unrealized Appreciation (Depreciation) 8,455 [6]
ProShares Ultra Australian Dollar [Member] | Australian Dollar Fx Currency Futures-CME, Expires September 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 77 [7]
Notional Amount at Value 7,219,520 [7]
Unrealized Appreciation (Depreciation) 63,500 [7]
ProShares VIX Short-Term Futures ETF [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) (6,613,486) [8]
ProShares VIX Short-Term Futures ETF [Member] | VIX Futures-CBOE, Expires July 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 4,028 [8]
Notional Amount at Value 50,148,600 [8]
Unrealized Appreciation (Depreciation) (5,476,013) [8]
ProShares VIX Short-Term Futures ETF [Member] | VIX Futures-CBOE, Expires August 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 3,624 [8]
Notional Amount at Value 48,380,400 [8]
Unrealized Appreciation (Depreciation) (1,137,473) [8]
ProShares VIX Mid-Term Futures ETF [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) (3,495,050) [9]
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures - CBOE, Expires October 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 450 [9]
Notional Amount at Value 6,750,000 [9]
Unrealized Appreciation (Depreciation) (1,062,040) [9]
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures CBOE, Expires November 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 855 [9]
Notional Amount at Value 13,338,000 [9]
Unrealized Appreciation (Depreciation) (1,474,770) [9]
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures CBOE, Expires December 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 855 [9]
Notional Amount at Value 13,680,000 [9]
Unrealized Appreciation (Depreciation) (849,690) [9]
ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures CBOE, Expires January 2015 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 405 [9]
Notional Amount at Value 6,763,500 [9]
Unrealized Appreciation (Depreciation) (108,550) [9]
ProShares Ultra VIX Short-Term Futures ETF [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) (40,533,346) [10]
ProShares Ultra VIX Short-Term Futures ETF [Member] | VIX Futures-CBOE, Expires July 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 24,158 [10]
Notional Amount at Value 300,767,100 [10]
Unrealized Appreciation (Depreciation) (33,369,308) [10]
ProShares Ultra VIX Short-Term Futures ETF [Member] | VIX Futures-CBOE, Expires August 2014 [Member]
  
Schedule of Investments [Line Items]  
Number of Contracts 21,742 [10]
Notional Amount at Value 290,255,700 [10]
Unrealized Appreciation (Depreciation) $ (7,164,038) [10]
[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 any time.
[2] Cash collateral in the amount of $2,639,670 was pledged to cover margin requirements for open futures contracts as of June 30, 2014.
[3] Cash collateral in the amount of $2,725,580 was pledged to cover margin requirements for open futures contracts as of June 30, 2014.
[4] 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.
[5] Cash collateral in the amount of $13,200 was pledged to cover margin requirements for open futures contracts as of June 30, 2014.
[6] Cash collateral in the amount of $9,075 was pledged to cover margin requirements for open futures contracts as of June 30, 2014.
[7] Cash collateral in the amount of $127,050 was pledged to cover margin requirements for open futures contracts as of June 30, 2014.
[8] Cash collateral in the amount of $20,781,600 was pledged to cover margin requirements for open futures contracts as of June 30, 2014.
[9] Cash collateral in the amount of $5,859,000 was pledged to cover margin requirements for open futures contracts as of June 30, 2014.
[10] Cash collateral in the amount of $124,654,800 was pledged to cover margin requirements for open futures contracts as of June 30, 2014.