v2.4.0.8
Schedule of Investments - Forward Agreements (Detail) (USD $)
 6 Months Ended
Jun. 30, 2014
ProShares UltraShort Gold [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) $ (10,583,508) [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 Paid (Received) 0.22% [1]
Settlement Date Jul. 07, 2014 [1]
Commitment to (Deliver)/Receive (59,500) [1]
Notional Amount at Value (78,243,690) [1],[2]
Unrealized Appreciation (Depreciation) (5,448,091) [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 Paid (Received) 0.32% [1]
Settlement Date Jul. 07, 2014 [1]
Commitment to (Deliver)/Receive (24,398) [1]
Notional Amount at Value (32,083,858) [1],[2]
Unrealized Appreciation (Depreciation) (2,015,729) [1]
ProShares UltraShort Gold [Member] | Forward Agreements with Societe Generale S.A. Based on 0.995 Fine Troy Ounce Gold [Member]
  
Schedule of Investments [Line Items]  
Rate Paid (Received) 0.42% [1]
Settlement Date Jul. 07, 2014 [1]
Commitment to (Deliver)/Receive (14,700) [1]
Notional Amount at Value (19,330,794) [1],[2]
Unrealized Appreciation (Depreciation) (1,118,143) [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 Paid (Received) 0.32% [1]
Settlement Date Jul. 07, 2014 [1]
Commitment to (Deliver)/Receive (28,550) [1]
Notional Amount at Value (37,543,821) [1],[2]
Unrealized Appreciation (Depreciation) (2,001,545) [1]
ProShares UltraShort Silver [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) (10,563,213) [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 Paid (Received) (0.34%) [3]
Settlement Date Jul. 07, 2014 [3]
Commitment to (Deliver)/Receive (2,660,000) [3]
Notional Amount at Value (55,521,116) [2],[3]
Unrealized Appreciation (Depreciation) (5,772,553) [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 Paid (Received) (0.24%) [3]
Settlement Date Jul. 07, 2014 [3]
Commitment to (Deliver)/Receive (874,500) [3]
Notional Amount at Value (18,253,089) [2],[3]
Unrealized Appreciation (Depreciation) (1,869,870) [3]
ProShares UltraShort Silver [Member] | Forward Agreements with Societe Generale S.A. Based on 0.999 Fine Troy Ounce Silver [Member]
  
Schedule of Investments [Line Items]  
Rate Paid (Received) (0.14%) [3]
Settlement Date Jul. 07, 2014 [3]
Commitment to (Deliver)/Receive (522,000) [3]
Notional Amount at Value (10,895,497) [2],[3]
Unrealized Appreciation (Depreciation) (959,772) [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 Paid (Received) (0.19%) [3]
Settlement Date Jul. 07, 2014 [3]
Commitment to (Deliver)/Receive (934,000) [3]
Notional Amount at Value (19,495,008) [2],[3]
Unrealized Appreciation (Depreciation) (1,961,018) [3]
ProShares Ultra Gold [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) 13,227,915 [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 Paid (Received) 0.38% [1]
Settlement Date Jul. 07, 2014 [1]
Commitment to (Deliver)/Receive 109,500 [1]
Notional Amount at Value 143,994,690 [1],[2]
Unrealized Appreciation (Depreciation) 7,156,303 [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 Paid (Received) 0.53% [1]
Settlement Date Jul. 07, 2014 [1]
Commitment to (Deliver)/Receive 41,220 [1]
Notional Amount at Value 54,205,124 [1],[2]
Unrealized Appreciation (Depreciation) 2,462,460 [1]
ProShares Ultra Gold [Member] | Forward Agreements with Societe Generale S.A. Based on 0.995 Fine Troy Ounce Gold [Member]
  
Schedule of Investments [Line Items]  
Rate Paid (Received) 0.58% [1]
Settlement Date Jul. 07, 2014 [1]
Commitment to (Deliver)/Receive 21,500 [1]
Notional Amount at Value 28,272,930 [1],[2]
Unrealized Appreciation (Depreciation) 1,379,253 [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 Paid (Received) 0.48% [1]
Settlement Date Jul. 07, 2014 [1]
Commitment to (Deliver)/Receive 33,600 [1]
Notional Amount at Value 44,184,672 [1],[2]
Unrealized Appreciation (Depreciation) 2,229,899 [1]
ProShares Ultra Silver [Member]
  
Schedule of Investments [Line Items]  
Unrealized Appreciation (Depreciation) 86,902,211 [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 Paid (Received) 0.94% [3]
Settlement Date Jul. 07, 2014 [3]
Commitment to (Deliver)/Receive 26,077,000 [3]
Notional Amount at Value 544,294,790 [2],[3]
Unrealized Appreciation (Depreciation) 45,349,782 [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 Paid (Received) 1.09% [3]
Settlement Date Jul. 07, 2014 [3]
Commitment to (Deliver)/Receive 7,929,800 [3]
Notional Amount at Value 165,515,543 [2],[3]
Unrealized Appreciation (Depreciation) 16,680,099 [3]
ProShares Ultra Silver [Member] | Forward Agreements with Societe Generale S.A. Based on 0.999 Fine Troy Ounce Silver [Member]
  
Schedule of Investments [Line Items]  
Rate Paid (Received) 1.14% [3]
Settlement Date Jul. 07, 2014 [3]
Commitment to (Deliver)/Receive 5,051,000 [3]
Notional Amount at Value 105,427,503 [2],[3]
Unrealized Appreciation (Depreciation) 9,222,909 [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 Paid (Received) 1.09% [3]
Settlement Date Jul. 07, 2014 [3]
Commitment to (Deliver)/Receive 8,943,000 [3]
Notional Amount at Value 186,663,662 [2],[3]
Unrealized Appreciation (Depreciation) $ 15,649,421 [3]
[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 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 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.