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Schedule of Investments - Forward Agreements (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
ProShares UltraShort Gold [Member]    
Schedule of Investments [Line Items]    
Unrealized Appreciation (Depreciation) $ 3,033,566 [1] $ 1,808,942 [2]
ProShares UltraShort Gold [Member] | Forward Agreements with Citibank N.A. Based on 0.995 Fine Troy Ounce Gold [Member]    
Schedule of Investments [Line Items]    
Rate Paid (Received) (0.85%) [1],[3] 0.50% [2],[4]
Settlement Date Jan. 10, 2017 [1] Jan. 06, 2016 [2]
Commitment to (Deliver)/Receive $ (44,500) [1] $ (6,500) [2]
Notional Amount at Value [5] (51,008,125) [1] (6,889,740) [2]
Unrealized Appreciation (Depreciation) $ 1,147,811 [1] $ 3,915 [2]
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) [2],[4]   0.25%
Settlement Date [2]   Jan. 06, 2016
Commitment to (Deliver)/Receive [2]   $ (68,100)
Notional Amount at Value [2],[5]   (72,186,681)
Unrealized Appreciation (Depreciation) [2]   $ 1,046,664
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) (0.70%) [1],[3] 0.60% [2],[4]
Settlement Date Jan. 10, 2017 [1] Jan. 06, 2016 [2]
Commitment to (Deliver)/Receive $ (25,498) [1] $ (26,298) [2]
Notional Amount at Value [5] (29,227,083) [1] (27,874,828) [2]
Unrealized Appreciation (Depreciation) $ 881,454 [1] $ 158,827 [2]
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) (0.65%) [1],[3] 0.74% [2],[4]
Settlement Date Jan. 10, 2017 [1] Jan. 06, 2016 [2]
Commitment to (Deliver)/Receive $ (14,600) [1] $ (14,000) [2]
Notional Amount at Value [5] (16,735,250) [1] (14,839,440) [2]
Unrealized Appreciation (Depreciation) $ 393,006 [1] $ 212,680 [2]
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) (0.74%) [1],[3] 0.61% [2],[4]
Settlement Date Jan. 10, 2017 [1] Jan. 06, 2016 [2]
Commitment to (Deliver)/Receive $ (26,250) [1] $ (26,350) [2]
Notional Amount at Value [5] (30,089,325) [1] (27,929,946) [2]
Unrealized Appreciation (Depreciation) 611,295 [1] 386,856 [2]
ProShares UltraShort Silver [Member]    
Schedule of Investments [Line Items]    
Unrealized Appreciation (Depreciation) $ 1,384,246 [1] $ 4,778,279 [2]
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) [2],[4]   (0.50%)
Settlement Date [2]   Jan. 06, 2016
Commitment to (Deliver)/Receive [2]   $ (3,253,000)
Notional Amount at Value [2],[5]   (44,962,315)
Unrealized Appreciation (Depreciation) [2]   $ 2,500,263
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) (0.80%) [1],[6] (0.10%) [2],[4]
Settlement Date Jan. 10, 2017 [1] Jan. 06, 2016 [2]
Commitment to (Deliver)/Receive $ (934,500) [1] $ (2,047,500) [2]
Notional Amount at Value [5] (15,181,326) [1] (28,298,907) [2]
Unrealized Appreciation (Depreciation) $ 323,829 [1] $ 1,044,986 [2]
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) (0.80%) [1],[6] 0.00% [2],[4]
Settlement Date Jan. 10, 2017 [1] Jan. 06, 2016 [2]
Commitment to (Deliver)/Receive $ (156,000) [1] $ (656,000) [2]
Notional Amount at Value [5] (2,534,314) [1] (9,066,707) [2]
Unrealized Appreciation (Depreciation) $ 86,543 [1] $ 438,975 [2]
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) (0.82%) [1],[6] (0.09%) [2],[4]
Settlement Date Jan. 10, 2017 [1] Jan. 06, 2016 [2]
Commitment to (Deliver)/Receive $ (657,000) [1] $ (2,135,000) [2]
Notional Amount at Value [5] (10,673,425) [1] (29,508,262) [2]
Unrealized Appreciation (Depreciation) $ 363,396 [1] 794,055 [2]
ProShares UltraShort Silver [Member] | Forward Agreements With Citibank, N.A. based on 0.999 Fine Troy Ounce Silver [Member]    
Schedule of Investments [Line Items]    
Rate Paid (Received) [1],[6] (1.05%)  
Settlement Date [1] Jan. 10, 2017  
Commitment to (Deliver)/Receive [1] $ (1,076,000)  
Notional Amount at Value [1],[5] (17,480,588)  
Unrealized Appreciation (Depreciation) [1] 610,478  
ProShares Ultra Gold [Member]    
Schedule of Investments [Line Items]    
Unrealized Appreciation (Depreciation) $ (4,431,107) [1] $ (2,250,595) [7]
ProShares Ultra Gold [Member] | Forward Agreements with Citibank N.A. Based on 0.995 Fine Troy Ounce Gold [Member]    
Schedule of Investments [Line Items]    
Rate Paid (Received) 1.35% [1],[8] 0.00% [4],[7]
Settlement Date Jan. 10, 2017 [1] Jan. 06, 2016 [7]
Commitment to (Deliver)/Receive $ 55,100 [1] $ 3,000 [7]
Notional Amount at Value [5] 63,158,375 [1] 3,179,880 [7]
Unrealized Appreciation (Depreciation) $ (1,464,982) [1] $ (4,614) [7]
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) [4],[7]   0.35%
Settlement Date [7]   Jan. 06, 2016
Commitment to (Deliver)/Receive [7]   $ 63,900
Notional Amount at Value [5],[7]   67,734,639
Unrealized Appreciation (Depreciation) [7]   $ (1,049,383)
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) 1.55% [1],[8] 0.25% [4],[7]
Settlement Date Jan. 10, 2017 [1] Jan. 06, 2016 [7]
Commitment to (Deliver)/Receive $ 42,320 [1] $ 23,620 [7]
Notional Amount at Value [5] 48,509,300 [1] 25,036,255 [7]
Unrealized Appreciation (Depreciation) $ (1,112,916) [1] $ (520,730) [7]
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) 1.54% [1],[8] 0.19% [4],[7]
Settlement Date Jan. 10, 2017 [1] Jan. 06, 2016 [7]
Commitment to (Deliver)/Receive $ 39,800 [1] $ 25,700 [7]
Notional Amount at Value [5] 45,621,148 [1] 27,240,972 [7]
Unrealized Appreciation (Depreciation) $ (1,209,622) [1] $ (430,876) [7]
ProShares Ultra Gold [Member] | Forward Agreements with Societe Generale based on 0.995 Troy Ounce Gold [Member]    
Schedule of Investments [Line Items]    
Rate Paid (Received) 1.55% [1],[8] 0.26% [4],[7]
Settlement Date Jan. 10, 2017 [1] Jan. 06, 2016 [7]
Commitment to (Deliver)/Receive $ 23,300 [1] $ 15,400 [7]
Notional Amount at Value [5] 26,707,625 [1] 16,323,384 [7]
Unrealized Appreciation (Depreciation) (643,587) [1] (244,992) [7]
ProShares Ultra Silver [Member]    
Schedule of Investments [Line Items]    
Unrealized Appreciation (Depreciation) $ (20,976,189) [1] $ (22,561,101) [7]
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) [4],[7]   1.10%
Settlement Date [7]   Jan. 06, 2016
Commitment to (Deliver)/Receive [7]   $ 13,088,000
Notional Amount at Value [5],[7]   180,899,718
Unrealized Appreciation (Depreciation) [7]   $ (9,355,945)
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) 1.65% [1],[3] 0.95% [4],[7]
Settlement Date Jan. 10, 2017 [1] Jan. 06, 2016 [7]
Commitment to (Deliver)/Receive $ 8,498,800 [1] $ 6,855,800 [7]
Notional Amount at Value [5] 138,066,406 [1] 94,755,383 [7]
Unrealized Appreciation (Depreciation) $ (5,869,092) [1] $ (5,106,853) [7]
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) 1.70% [1],[3] 1.00% [4],[7]
Settlement Date Jan. 10, 2017 [1] Jan. 06, 2016 [7]
Commitment to (Deliver)/Receive $ 4,484,000 [1] $ 3,984,000 [7]
Notional Amount at Value [5] 72,845,270 [1] 55,063,661 [7]
Unrealized Appreciation (Depreciation) $ (2,532,729) [1] $ (2,704,459) [7]
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) 1.72% [1],[3] 0.99% [4],[7]
Settlement Date Jan. 10, 2017 [1] Jan. 06, 2016 [7]
Commitment to (Deliver)/Receive $ 8,632,000 [1] $ 7,373,000 [7]
Notional Amount at Value [5] 140,232,882 [1] 101,903,708 [7]
Unrealized Appreciation (Depreciation) $ (5,628,359) [1] $ (5,393,844) [7]
ProShares Ultra Silver [Member] | Forward Agreements With Citibank, N.A. based on 0.999 Fine Troy Ounce Silver [Member]    
Schedule of Investments [Line Items]    
Rate Paid (Received) [1],[3] 1.55%  
Settlement Date [1] Jan. 10, 2017  
Commitment to (Deliver)/Receive [1] $ 12,327,000  
Notional Amount at Value [1],[5] 200,263,209  
Unrealized Appreciation (Depreciation) [1] $ (6,946,009)  
[1] The positions and counterparties herein are as of December 31, 2016. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at anytime.
[2] The positions and counterparties herein are as of December 31, 2015. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at anytime.
[3] Reflects the floating financing rate, as of December 31, 2016, on the notional amount of the forward agreement paid to the counterparty or received from the counterparty, excluding any commissions.
[4] Reflects the floating financing rate, as of December 31, 2015, on the notional amount of the forward agreement paid to the counterparty or received from the counterparty, excluding any commissions.
[5] For forward agreements, a positive amount represents "long" exposure to the underlying commodity. A negative amount represents "short" exposure to the underlying commodity.
[6] Reflects the floating financing rate, as of December 31, 2016, on the notional amount of the forward agreement paid to the counterparty or received from the counterparty, excluding any commissions.
[7] The positions and counterparties herein are as of December 31, 2015. The Funds continually evaluate different counterparties for their transactions and counterparties are subject to change. New counterparties can be added at any time.
[8] Reflects the floating financing rate, as of December 31, 2016 on the notional amount of the forward agreement paid to the counterparty or received from the counterparty, excluding any commissions.