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Schedule of Investments (Forward Agreements) (Detail) (USD $)
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Mar. 31, 2013
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ProShares UltraShort Gold [Member]
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| Schedule of Investments [Line Items] | ||||||
| Unrealized Appreciation (Depreciation) | $ (3,246,282) | [1] | ||||
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ProShares UltraShort Gold [Member] | Forward agreements with Deutsche Bank AG based on 0.995 Fine Troy Ounce Gold [Member]
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| Schedule of Investments [Line Items] | ||||||
| Settlement Date | Apr. 08, 2013 | [1] | ||||
| Commitment to (Deliver)/Receive | (73,300) | [1] | ||||
| Notional Amount at Value | (117,160,521) | [1],[2] | ||||
| Unrealized Appreciation (Depreciation) | (1,752,078) | [1] | ||||
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ProShares UltraShort Gold [Member] | Forward agreements with Goldman Sachs International based on 0.995 Fine Troy Ounce Gold [Member]
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| Schedule of Investments [Line Items] | ||||||
| Settlement Date | Apr. 08, 2013 | [1] | ||||
| Commitment to (Deliver)/Receive | (21,398) | [1] | ||||
| Notional Amount at Value | (34,201,921) | [1],[2] | ||||
| Unrealized Appreciation (Depreciation) | (589,404) | [1] | ||||
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ProShares UltraShort Gold [Member] | Forward agreements with Societe Generale S.A. based on 0.995 Fine Troy Ounce Gold [Member]
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| Schedule of Investments [Line Items] | ||||||
| Settlement Date | Apr. 08, 2013 | [1] | ||||
| Commitment to (Deliver)/Receive | (18,700) | [1] | ||||
| Notional Amount at Value | (29,889,519) | [1],[2] | ||||
| Unrealized Appreciation (Depreciation) | (460,599) | [1] | ||||
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ProShares UltraShort Gold [Member] | Forward agreements with UBS AG based on 0.995 Fine Troy Ounce Gold [Member]
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| Schedule of Investments [Line Items] | ||||||
| Settlement Date | Apr. 08, 2013 | [1] | ||||
| Commitment to (Deliver)/Receive | (17,750) | [1] | ||||
| Notional Amount at Value | (28,371,068) | [1],[2] | ||||
| Unrealized Appreciation (Depreciation) | (444,201) | [1] | ||||
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ProShares UltraShort Silver [Member]
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| Schedule of Investments [Line Items] | ||||||
| Unrealized Appreciation (Depreciation) | 255,288 | [1] | ||||
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ProShares UltraShort Silver [Member] | Forward agreements with Deutsche Bank AG based On 0.999 Fine Troy Ounce Silver [Member]
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| Schedule of Investments [Line Items] | ||||||
| Settlement Date | Apr. 08, 2013 | [1] | ||||
| Commitment to (Deliver)/Receive | (3,040,000) | [1] | ||||
| Notional Amount at Value | (87,084,752) | [1],[2] | ||||
| Unrealized Appreciation (Depreciation) | 55,643 | [1] | ||||
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ProShares UltraShort Silver [Member] | Forward agreements with Goldman Sachs International based On 0.999 Troy Ounce Silver [Member]
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| Schedule of Investments [Line Items] | ||||||
| Settlement Date | Apr. 08, 2013 | [1] | ||||
| Commitment to (Deliver)/Receive | (1,588,500) | [1] | ||||
| Notional Amount at Value | (45,504,648) | [1],[2] | ||||
| Unrealized Appreciation (Depreciation) | 63,340 | [1] | ||||
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ProShares UltraShort Silver [Member] | Forward agreements with Societe Generale S.A. based on 0.999 Fine Troy Ounce Silver [Member]
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| Schedule of Investments [Line Items] | ||||||
| Settlement Date | Apr. 08, 2013 | [1] | ||||
| Commitment to (Deliver)/Receive | (1,235,000) | [1] | ||||
| Notional Amount at Value | (35,378,181) | [1],[2] | ||||
| Unrealized Appreciation (Depreciation) | 147,618 | [1] | ||||
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ProShares UltraShort Silver [Member] | Forward agreements with UBS AG based on 0.999 Fine Troy Ounce Silver [Member]
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| Schedule of Investments [Line Items] | ||||||
| Settlement Date | Apr. 08, 2013 | [1] | ||||
| Commitment to (Deliver)/Receive | (1,519,000) | [1] | ||||
| Notional Amount at Value | (43,513,730) | [1],[2] | ||||
| Unrealized Appreciation (Depreciation) | (11,313) | [1] | ||||
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ProShares Ultra Gold [Member]
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| Schedule of Investments [Line Items] | ||||||
| Unrealized Appreciation (Depreciation) | 9,222,440 | [1] | ||||
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ProShares Ultra Gold [Member] | Forward agreements with Deutsche Bank AG based on 0.995 Fine Troy Ounce Gold [Member]
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| Schedule of Investments [Line Items] | ||||||
| Settlement Date | Apr. 08, 2013 | [1] | ||||
| Commitment to (Deliver)/Receive | 191,100 | [1] | ||||
| Notional Amount at Value | 305,448,507 | [1],[2] | ||||
| Unrealized Appreciation (Depreciation) | 4,465,287 | [1] | ||||
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ProShares Ultra Gold [Member] | Forward agreements with Goldman Sachs International based on 0.995 Fine Troy Ounce Gold [Member]
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| Schedule of Investments [Line Items] | ||||||
| Settlement Date | Apr. 08, 2013 | [1] | ||||
| Commitment to (Deliver)/Receive | 69,420 | [1] | ||||
| Notional Amount at Value | 110,958,845 | [1],[2] | ||||
| Unrealized Appreciation (Depreciation) | 1,574,862 | [1] | ||||
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ProShares Ultra Gold [Member] | Forward agreements with Societe Generale S.A. based on 0.995 Fine Troy Ounce Gold [Member]
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| Schedule of Investments [Line Items] | ||||||
| Settlement Date | Apr. 08, 2013 | [1] | ||||
| Commitment to (Deliver)/Receive | 70,600 | [1] | ||||
| Notional Amount at Value | 112,844,922 | [1],[2] | ||||
| Unrealized Appreciation (Depreciation) | 1,671,035 | [1] | ||||
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ProShares Ultra Gold [Member] | Forward agreements with UBS AG based on 0.995 Fine Troy Ounce Gold [Member]
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| Schedule of Investments [Line Items] | ||||||
| Settlement Date | Apr. 08, 2013 | [1] | ||||
| Commitment to (Deliver)/Receive | 64,700 | [1] | ||||
| Notional Amount at Value | 103,414,539 | [1],[2] | ||||
| Unrealized Appreciation (Depreciation) | 1,511,256 | [1] | ||||
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ProShares Ultra Silver [Member]
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| Schedule of Investments [Line Items] | ||||||
| Unrealized Appreciation (Depreciation) | (8,106,718) | [1] | ||||
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ProShares Ultra Silver [Member] | Forward agreements with Deutsche Bank AG based On 0.999 Fine Troy Ounce Silver [Member]
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| Schedule of Investments [Line Items] | ||||||
| Settlement Date | Apr. 08, 2013 | [1] | ||||
| Commitment to (Deliver)/Receive | 30,481,000 | [1] | ||||
| Notional Amount at Value | 873,167,870 | [1],[2] | ||||
| Unrealized Appreciation (Depreciation) | (4,807,077) | [1] | ||||
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ProShares Ultra Silver [Member] | Forward agreements with Goldman Sachs International based On 0.999 Troy Ounce Silver [Member]
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| Schedule of Investments [Line Items] | ||||||
| Settlement Date | Apr. 08, 2013 | [1] | ||||
| Commitment to (Deliver)/Receive | 8,142,800 | [1] | ||||
| Notional Amount at Value | 233,261,092 | [1],[2] | ||||
| Unrealized Appreciation (Depreciation) | (1,237,902) | [1] | ||||
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ProShares Ultra Silver [Member] | Forward agreements with Societe Generale S.A. based on 0.999 Fine Troy Ounce Silver [Member]
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| Schedule of Investments [Line Items] | ||||||
| Settlement Date | Apr. 08, 2013 | [1] | ||||
| Commitment to (Deliver)/Receive | 8,742,000 | [1] | ||||
| Notional Amount at Value | 250,425,955 | [1],[2] | ||||
| Unrealized Appreciation (Depreciation) | (1,056,353) | [1] | ||||
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ProShares Ultra Silver [Member] | Forward agreements with UBS AG based on 0.999 Fine Troy Ounce Silver [Member]
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| Schedule of Investments [Line Items] | ||||||
| Settlement Date | Apr. 08, 2013 | [1] | ||||
| Commitment to (Deliver)/Receive | 4,744,000 | [1] | ||||
| Notional Amount at Value | 135,898,047 | [1],[2] | ||||
| Unrealized Appreciation (Depreciation) | $ (1,005,386) | [1] | ||||
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