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Investments - Offsetting of Financial Assets and Liabilities (Detail) (USD $)
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Mar. 31, 2014
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Dec. 31, 2013
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ProShares UltraShort DJ-UBS Commodity [Member] | Swap Agreements [Member]
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|
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| Derivative [Line Items] |
|
|
| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
$ 102,269 |
|
| Gross Amounts Offset in the Statement of Financial Conditions |
|
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| Net Amount |
102,269 |
|
| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
|
27,665 |
| Gross Amounts Offset in the Statement of Financial Conditions |
|
|
| Net Amount |
|
27,665 |
|
ProShares UltraShort DJ-UBS Crude Oil [Member] | Swap Agreements [Member]
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|
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| Derivative [Line Items] |
|
|
| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
71,219 |
|
| Gross Amounts Offset in the Statement of Financial Conditions |
|
|
| Net Amount |
71,219 |
|
| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
764,150 |
2,332,900 |
| Gross Amounts Offset in the Statement of Financial Conditions |
|
|
| Net Amount |
764,150 |
2,332,900 |
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ProShares UltraShort DJ-UBS Crude Oil [Member] | VIX Futures Contracts [Member]
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|
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| Derivative [Line Items] |
|
|
| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
345,825 |
1,503,943 |
| Gross Amounts Offset in the Statement of Financial Conditions |
|
|
| Net Amount |
345,825 |
1,503,943 |
| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
|
|
| Gross Amounts Offset in the Statement of Financial Conditions |
|
|
| Net Amount |
|
|
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ProShares UltraShort DJ-UBS Natural Gas [Member] | VIX Futures Contracts [Member]
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|
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| Derivative [Line Items] |
|
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
2,752,495 |
1,520,548 |
| Gross Amounts Offset in the Statement of Financial Conditions |
|
|
| Net Amount |
2,752,495 |
1,520,548 |
| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
|
|
| Gross Amounts Offset in the Statement of Financial Conditions |
|
|
| Net Amount |
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ProShares UltraShort Gold [Member] | VIX Futures Contracts [Member]
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|
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| Derivative [Line Items] |
|
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
2,100 |
300 |
| Gross Amounts Offset in the Statement of Financial Conditions |
|
|
| Net Amount |
2,100 |
300 |
| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
|
|
| Gross Amounts Offset in the Statement of Financial Conditions |
|
|
| Net Amount |
|
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ProShares UltraShort Gold [Member] | Forward Agreements [Member]
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|
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| Derivative [Line Items] |
|
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
8,531,762 |
5,633,053 |
| Gross Amounts Offset in the Statement of Financial Conditions |
|
|
| Net Amount |
8,531,762 |
5,633,053 |
| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
|
|
| Gross Amounts Offset in the Statement of Financial Conditions |
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| Net Amount |
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ProShares UltraShort Silver [Member] | VIX Futures Contracts [Member]
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|
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| Derivative [Line Items] |
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
|
2,450 |
| Gross Amounts Offset in the Statement of Financial Conditions |
|
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| Net Amount |
|
2,450 |
| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
440 |
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| Gross Amounts Offset in the Statement of Financial Conditions |
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| Net Amount |
440 |
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ProShares UltraShort Silver [Member] | Forward Agreements [Member]
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| Derivative [Line Items] |
|
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
7,742,580 |
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| Gross Amounts Offset in the Statement of Financial Conditions |
|
|
| Net Amount |
7,742,580 |
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| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
|
2,227,857 |
| Gross Amounts Offset in the Statement of Financial Conditions |
|
|
| Net Amount |
|
2,227,857 |
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ProShares Short Euro [Member] | VIX Futures Contracts [Member]
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|
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| Derivative [Line Items] |
|
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
|
9,100 |
| Gross Amounts Offset in the Statement of Financial Conditions |
|
|
| Net Amount |
|
9,100 |
| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
12,300 |
|
| Gross Amounts Offset in the Statement of Financial Conditions |
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| Net Amount |
12,300 |
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ProShares UltraShort Australian Dollar [Member] | VIX Futures Contracts [Member]
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|
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| Derivative [Line Items] |
|
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
|
|
| Gross Amounts Offset in the Statement of Financial Conditions |
|
|
| Net Amount |
|
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| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
89,099 |
86,166 |
| Gross Amounts Offset in the Statement of Financial Conditions |
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| Net Amount |
89,099 |
86,166 |
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ProShares UltraShort Euro [Member] | Foreign Currency Forward Contracts [Member]
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|
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| Derivative [Line Items] |
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
|
151,351 |
| Gross Amounts Offset in the Statement of Financial Conditions |
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| Net Amount |
|
151,351 |
| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
3,724,310 |
13,899,858 |
| Gross Amounts Offset in the Statement of Financial Conditions |
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| Net Amount |
3,724,310 |
13,899,858 |
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ProShares UltraShort Yen [Member] | Foreign Currency Forward Contracts [Member]
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|
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| Derivative [Line Items] |
|
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
6,121,534 |
31,317,568 |
| Gross Amounts Offset in the Statement of Financial Conditions |
|
|
| Net Amount |
6,121,534 |
31,317,568 |
| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
1,275,150 |
1,930,884 |
| Gross Amounts Offset in the Statement of Financial Conditions |
|
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| Net Amount |
1,275,150 |
1,930,884 |
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ProShares Ultra DJ-UBS Commodity [Member] | Swap Agreements [Member]
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|
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| Derivative [Line Items] |
|
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
|
15,078 |
| Gross Amounts Offset in the Statement of Financial Conditions |
|
|
| Net Amount |
|
15,078 |
| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
114,128 |
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| Gross Amounts Offset in the Statement of Financial Conditions |
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| Net Amount |
114,128 |
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ProShares Ultra DJ-UBS Crude Oil [Member] | Swap Agreements [Member]
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|
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| Derivative [Line Items] |
|
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
959,951 |
1,957,893 |
| Gross Amounts Offset in the Statement of Financial Conditions |
|
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| Net Amount |
959,951 |
1,957,893 |
| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
|
|
| Gross Amounts Offset in the Statement of Financial Conditions |
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| Net Amount |
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ProShares Ultra DJ-UBS Crude Oil [Member] | VIX Futures Contracts [Member]
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|
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| Derivative [Line Items] |
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
121,862 |
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| Gross Amounts Offset in the Statement of Financial Conditions |
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| Net Amount |
121,862 |
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| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
|
997,210 |
| Gross Amounts Offset in the Statement of Financial Conditions |
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| Net Amount |
|
997,210 |
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ProShares Ultra DJ-UBS Natural Gas [Member] | VIX Futures Contracts [Member]
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|
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| Derivative [Line Items] |
|
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
|
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| Gross Amounts Offset in the Statement of Financial Conditions |
|
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| Net Amount |
|
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| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
1,050,517 |
5,628,532 |
| Gross Amounts Offset in the Statement of Financial Conditions |
|
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| Net Amount |
1,050,517 |
5,628,532 |
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ProShares Ultra Gold [Member] | VIX Futures Contracts [Member]
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|
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| Derivative [Line Items] |
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
|
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| Gross Amounts Offset in the Statement of Financial Conditions |
|
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| Net Amount |
|
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| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
2,200 |
300 |
| Gross Amounts Offset in the Statement of Financial Conditions |
|
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| Net Amount |
2,200 |
300 |
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ProShares Ultra Gold [Member] | Forward Agreements [Member]
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|
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| Derivative [Line Items] |
|
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
|
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| Gross Amounts Offset in the Statement of Financial Conditions |
|
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| Net Amount |
|
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| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
12,010,072 |
6,812,974 |
| Gross Amounts Offset in the Statement of Financial Conditions |
|
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| Net Amount |
12,010,072 |
6,812,974 |
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ProShares Ultra Silver [Member] | VIX Futures Contracts [Member]
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|
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| Derivative [Line Items] |
|
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
|
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| Gross Amounts Offset in the Statement of Financial Conditions |
|
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| Net Amount |
|
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| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
380 |
2,450 |
| Gross Amounts Offset in the Statement of Financial Conditions |
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| Net Amount |
380 |
2,450 |
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ProShares Ultra Silver [Member] | Forward Agreements [Member]
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|
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| Derivative [Line Items] |
|
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
|
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| Gross Amounts Offset in the Statement of Financial Conditions |
|
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| Net Amount |
|
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| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
58,138,361 |
2,492,880 |
| Gross Amounts Offset in the Statement of Financial Conditions |
|
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| Net Amount |
58,138,361 |
2,492,880 |
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ProShares Ultra Australian Dollar [Member] | VIX Futures Contracts [Member]
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|
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| Derivative [Line Items] |
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
13,503 |
10,650 |
| Gross Amounts Offset in the Statement of Financial Conditions |
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| Net Amount |
13,503 |
10,650 |
| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
|
|
| Gross Amounts Offset in the Statement of Financial Conditions |
|
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| Net Amount |
|
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ProShares Ultra Euro [Member] | Foreign Currency Forward Contracts [Member]
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|
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| Derivative [Line Items] |
|
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
21,019 |
120,908 |
| Gross Amounts Offset in the Statement of Financial Conditions |
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| Net Amount |
21,019 |
120,908 |
| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
35 |
19,946 |
| Gross Amounts Offset in the Statement of Financial Conditions |
|
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| Net Amount |
35 |
19,946 |
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ProShares Ultra Yen [Member] | Foreign Currency Forward Contracts [Member]
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|
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| Derivative [Line Items] |
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
1,004 |
4,052 |
| Gross Amounts Offset in the Statement of Financial Conditions |
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| Net Amount |
1,004 |
4,052 |
| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
42,233 |
163,361 |
| Gross Amounts Offset in the Statement of Financial Conditions |
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| Net Amount |
42,233 |
163,361 |
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ProShares VIX Short-Term Futures ETF [Member] | VIX Futures Contracts [Member]
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|
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| Derivative [Line Items] |
|
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
|
3,179,017 |
| Gross Amounts Offset in the Statement of Financial Conditions |
|
|
| Net Amount |
|
3,179,017 |
| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
3,088,786 |
|
| Gross Amounts Offset in the Statement of Financial Conditions |
|
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| Net Amount |
3,088,786 |
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ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures Contracts [Member]
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|
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| Derivative [Line Items] |
|
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
|
100,734 |
| Gross Amounts Offset in the Statement of Financial Conditions |
|
|
| Net Amount |
|
100,734 |
| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
1,009,664 |
|
| Gross Amounts Offset in the Statement of Financial Conditions |
|
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| Net Amount |
1,009,664 |
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ProShares Ultra VIX Short-Term Futures ETF [Member] | VIX Futures Contracts [Member]
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|
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| Derivative [Line Items] |
|
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
|
|
| Gross Amounts Offset in the Statement of Financial Conditions |
|
|
| Net Amount |
|
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| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
24,525,510 |
3,356,803 |
| Gross Amounts Offset in the Statement of Financial Conditions |
|
|
| Net Amount |
24,525,510 |
3,356,803 |
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ProShares Short VIX Short-Term Futures ETF [Member] | VIX Futures Contracts [Member]
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|
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| Derivative [Line Items] |
|
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| Gross Amounts of Recognized Assets presented in the Statement of Financial Conditions |
6,484,331 |
603,833 |
| Gross Amounts Offset in the Statement of Financial Conditions |
|
|
| Net Amount |
6,484,331 |
603,833 |
| Gross Amounts of Recognized Liabilities presented in the Statement of Financial Conditions |
|
|
| Gross Amounts Offset in the Statement of Financial Conditions |
|
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| Net Amount |
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