v2.4.0.8
Schedule of Investments - Forward Agreements (Detail) (USD $)
Mar. 31, 2014
ProShares UltraShort Gold [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) $ 8,531,762 [1]
ProShares UltraShort Gold [Member] | Forward Agreements with Deutsche Bank AG Based on 0.995 Fine Troy Ounce Gold [Member]
  
Schedule of Investments [Line Items]  
Rate Receive (Paid) 0.30% [1]
Settlement Date Apr. 07, 2014 [1]
Commitment to (Deliver)/Receive (94,700) [1]
Notional Amount at Value (122,330,619) [1],[2]
Unrealized Appreciation (Depreciation) 4,557,728 [1]
ProShares UltraShort Gold [Member] | Forward Agreements with Goldman Sachs International Based on 0.995 Fine Troy Ounce Gold [Member]
  
Schedule of Investments [Line Items]  
Rate Receive (Paid) 0.40% [1]
Settlement Date Apr. 07, 2014 [1]
Commitment to (Deliver)/Receive (32,598) [1]
Notional Amount at Value (42,109,118) [1],[2]
Unrealized Appreciation (Depreciation) 1,618,593 [1]
ProShares UltraShort Gold [Member] | Forward Agreements with Societe Generale SA Based on 0.995 Fine Troy Ounce Gold [Member]
  
Schedule of Investments [Line Items]  
Rate Receive (Paid) 0.50% [1]
Settlement Date Apr. 07, 2014 [1]
Commitment to (Deliver)/Receive (15,600) [1]
Notional Amount at Value (20,151,612) [1],[2]
Unrealized Appreciation (Depreciation) 827,157 [1]
ProShares UltraShort Gold [Member] | Forward Agreements with UBS AG Based on 0.995 Fine Troy Ounce Gold [Member]
  
Schedule of Investments [Line Items]  
Rate Receive (Paid) 0.40% [1]
Settlement Date Apr. 07, 2014 [1]
Commitment to (Deliver)/Receive (34,150) [1]
Notional Amount at Value (44,113,946) [1],[2]
Unrealized Appreciation (Depreciation) 1,528,284 [1]
ProShares UltraShort Silver [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) 7,742,580 [3]
ProShares UltraShort Silver [Member] | Forward Agreements with Deutsche Bank AG Based on 0.999 Fine Troy Ounce Silver [Member]
  
Schedule of Investments [Line Items]  
Rate Receive (Paid) 0.30% [3]
Settlement Date Apr. 07, 2014 [3]
Commitment to (Deliver)/Receive (3,343,000) [3]
Notional Amount at Value (66,767,733) [2],[3]
Unrealized Appreciation (Depreciation) 3,858,673 [3]
ProShares UltraShort Silver [Member] | Forward Agreements with Goldman Sachs International Based on 0.999 Fine Troy Ounce Silver [Member]
  
Schedule of Investments [Line Items]  
Rate Receive (Paid) 0.40% [3]
Settlement Date Apr. 07, 2014 [3]
Commitment to (Deliver)/Receive (1,352,500) [3]
Notional Amount at Value (27,012,671) [2],[3]
Unrealized Appreciation (Depreciation) 1,401,484 [3]
ProShares UltraShort Silver [Member] | Forward Agreements with Societe Generale SA Based on 0.999 Fine Troy Ounce Silver [Member]
  
Schedule of Investments [Line Items]  
Rate Receive (Paid) 0.50% [3]
Settlement Date Apr. 07, 2014 [3]
Commitment to (Deliver)/Receive (820,000) [3]
Notional Amount at Value (16,377,368) [2],[3]
Unrealized Appreciation (Depreciation) 920,983 [3]
ProShares UltraShort Silver [Member] | Forward Agreements with UBS AG Based on 0.999 Fine Troy Ounce Silver [Member]
  
Schedule of Investments [Line Items]  
Rate Receive (Paid) 0.45% [3]
Settlement Date Apr. 07, 2014 [3]
Commitment to (Deliver)/Receive (1,586,000) [3]
Notional Amount at Value (31,676,226) [2],[3]
Unrealized Appreciation (Depreciation) 1,561,440 [3]
ProShares Ultra Gold [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) (12,010,072) [1]
ProShares Ultra Gold [Member] | Forward Agreements with Deutsche Bank AG Based on 0.995 Fine Troy Ounce Gold [Member]
  
Schedule of Investments [Line Items]  
Rate Receive (Paid) 0.30% [1]
Settlement Date Apr. 07, 2014 [1]
Commitment to (Deliver)/Receive 109,900 [1]
Notional Amount at Value 141,965,523 [1],[2]
Unrealized Appreciation (Depreciation) (6,314,073) [1]
ProShares Ultra Gold [Member] | Forward Agreements with Goldman Sachs International Based on 0.995 Fine Troy Ounce Gold [Member]
  
Schedule of Investments [Line Items]  
Rate Receive (Paid) 0.45% [1]
Settlement Date Apr. 07, 2014 [1]
Commitment to (Deliver)/Receive 41,220 [1]
Notional Amount at Value 53,246,759 [1],[2]
Unrealized Appreciation (Depreciation) (2,340,133) [1]
ProShares Ultra Gold [Member] | Forward Agreements with Societe Generale SA Based on 0.995 Fine Troy Ounce Gold [Member]
  
Schedule of Investments [Line Items]  
Rate Receive (Paid) 0.50% [1]
Settlement Date Apr. 07, 2014 [1]
Commitment to (Deliver)/Receive 21,000 [1]
Notional Amount at Value 27,127,170 [1],[2]
Unrealized Appreciation (Depreciation) (1,128,141) [1]
ProShares Ultra Gold [Member] | Forward Agreements with UBS AG Based on 0.995 Fine Troy Ounce Gold [Member]
  
Schedule of Investments [Line Items]  
Rate Receive (Paid) 0.40% [1]
Settlement Date Apr. 07, 2014 [1]
Commitment to (Deliver)/Receive 38,800 [1]
Notional Amount at Value 50,120,676 [1],[2]
Unrealized Appreciation (Depreciation) (2,227,725) [1]
ProShares Ultra Silver [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) (58,138,361) [3]
ProShares Ultra Silver [Member] | Forward Agreements with Deutsche Bank AG Based on 0.999 Fine Troy Ounce Silver [Member]
  
Schedule of Investments [Line Items]  
Rate Receive (Paid) 0.30% [3]
Settlement Date Apr. 07, 2014 [3]
Commitment to (Deliver)/Receive 25,173,000 [3]
Notional Amount at Value 502,765,225 [3],[4]
Unrealized Appreciation (Depreciation) (30,257,024) [3]
ProShares Ultra Silver [Member] | Forward Agreements with Goldman Sachs International Based on 0.999 Fine Troy Ounce Silver [Member]
  
Schedule of Investments [Line Items]  
Rate Receive (Paid) 0.45% [3]
Settlement Date Apr. 07, 2014 [3]
Commitment to (Deliver)/Receive 9,451,800 [3]
Notional Amount at Value 188,775,130 [3],[4]
Unrealized Appreciation (Depreciation) (11,457,887) [3]
ProShares Ultra Silver [Member] | Forward Agreements with Societe Generale SA Based on 0.999 Fine Troy Ounce Silver [Member]
  
Schedule of Investments [Line Items]  
Rate Receive (Paid) 0.50% [3]
Settlement Date Apr. 07, 2014 [3]
Commitment to (Deliver)/Receive 4,307,000 [3]
Notional Amount at Value 86,021,127 [3],[4]
Unrealized Appreciation (Depreciation) (5,025,453) [3]
ProShares Ultra Silver [Member] | Forward Agreements with UBS AG Based on 0.999 Fine Troy Ounce Silver [Member]
  
Schedule of Investments [Line Items]  
Rate Receive (Paid) 0.45% [3]
Settlement Date Apr. 07, 2014 [3]
Commitment to (Deliver)/Receive 9,372,000 [3]
Notional Amount at Value 187,181,333 [3],[4]
Unrealized Appreciation (Depreciation) $ (11,397,997) [3]
[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 anytime.
[2] For forward agreements, a positive amount represents "long" exposure to the underlying commodity. A negative amount represents "short" exposure to the underlying commodity.
[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 any time.
[4] For forward agreements, a positive amount represents "long" exposure to the underlying commodity. A negative amount represents "short" exposure to the underlying commodity