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Significant Accounting Policies - Calculation of Funds' Final Net Asset Value for Creation and Redemption of Fund Shares (Parenthetical) (Detail)
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6 Months Ended |
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Jun. 30, 2014
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ProShares UltraShort Bloomberg Commodity [Member]
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| Significant Accounting Policies [Line Items] | |
| NAV Calculation Time | 3:00 p.m. |
| NAV Calculation Date | June 30 |
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ProShares Ultra Bloomberg Commodity [Member]
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| Significant Accounting Policies [Line Items] | |
| NAV Calculation Time | 3:00 p.m. |
| NAV Calculation Date | June 30 |
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July 31, 2014 [Member] | ProShares UltraShort Bloomberg Commodity [Member]
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| Significant Accounting Policies [Line Items] | |
| NAV Calculation Time | 2:30 p.m. |
| NAV Calculation Date | July 31 |
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July 31, 2014 [Member] | ProShares Ultra Bloomberg Commodity [Member]
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| Significant Accounting Policies [Line Items] | |
| NAV Calculation Time | 2:30 p.m. |
| NAV Calculation Date | July 31 |