|
Significant Accounting Policies - Valuation of Investments (Detail) (USD $)
|
3 Months Ended | 12 Months Ended |
|---|---|---|
|
Mar. 31, 2014
|
Dec. 31, 2013
|
|
| Significant Accounting Policies [Line Items] | ||
| Level III portfolio investments | $ 0 | $ 0 |
|
ProShares UltraShort DJ-UBS Commodity [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 2,589,002 | 3,426,225 |
|
ProShares UltraShort DJ-UBS Crude Oil [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 281,301,351 | 244,018,950 |
|
ProShares UltraShort DJ-UBS Natural Gas [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 61,232,570 | 19,317,013 |
|
ProShares UltraShort Gold [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 114,389,278 | 154,635,902 |
|
ProShares UltraShort Silver [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 74,936,760 | 112,612,409 |
|
ProShares Short Euro [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 6,275,157 | 7,868,825 |
|
ProShares UltraShort Australian Dollar [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 18,005,588 | 25,116,112 |
|
ProShares UltraShort Euro [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 410,586,544 | 424,098,652 |
|
ProShares UltraShort Yen [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 405,582,924 | 587,983,948 |
|
ProShares Ultra DJ-UBS Commodity [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 2,296,768 | 2,831,766 |
|
ProShares Ultra DJ-UBS Crude Oil [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 115,123,255 | 140,020,164 |
|
ProShares Ultra DJ-UBS Natural Gas [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 16,426,567 | 55,264,472 |
|
ProShares Ultra Gold [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 136,312,320 | 134,053,416 |
|
ProShares Ultra Silver [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 472,557,491 | 465,361,896 |
|
ProShares Ultra Australian Dollar [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 2,968,877 | 2,598,219 |
|
ProShares Ultra Euro [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 2,328,721 | 2,556,825 |
|
ProShares Ultra Yen [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 2,430,622 | 2,769,247 |
|
ProShares VIX Short-Term Futures ETF [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 89,123,845 | 190,983,697 |
|
ProShares VIX Mid-Term Futures ETF [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 46,688,561 | 41,143,544 |
|
ProShares Ultra VIX Short-Term Futures ETF [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 144,151,681 | 85,523,576 |
|
ProShares Short VIX Short-Term Futures ETF [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 177,573,312 | 113,675,977 |
|
Total Trust [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 2,582,881,194 | 2,815,860,835 |
|
Level I - Quoted Prices [Member] | ProShares UltraShort DJ-UBS Commodity [Member] | Short-Term U.S. Government and Agencies [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 2,486,733 | 3,453,890 |
|
Level I - Quoted Prices [Member] | ProShares UltraShort DJ-UBS Crude Oil [Member] | Short-Term U.S. Government and Agencies [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 288,258,596 | 247,584,623 |
|
Level I - Quoted Prices [Member] | ProShares UltraShort DJ-UBS Crude Oil [Member] | VIX Futures Contracts [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | (6,264,314) | (1,232,773) |
|
Level I - Quoted Prices [Member] | ProShares UltraShort DJ-UBS Natural Gas [Member] | Short-Term U.S. Government and Agencies [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 56,753,250 | 18,274,713 |
|
Level I - Quoted Prices [Member] | ProShares UltraShort DJ-UBS Natural Gas [Member] | VIX Futures Contracts [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 4,479,320 | 1,042,300 |
|
Level I - Quoted Prices [Member] | ProShares UltraShort Gold [Member] | Short-Term U.S. Government and Agencies [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 105,840,656 | 148,988,329 |
|
Level I - Quoted Prices [Member] | ProShares UltraShort Gold [Member] | VIX Futures Contracts [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 16,860 | 14,520 |
|
Level I - Quoted Prices [Member] | ProShares UltraShort Silver [Member] | Short-Term U.S. Government and Agencies [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 67,188,850 | 114,826,066 |
|
Level I - Quoted Prices [Member] | ProShares UltraShort Silver [Member] | VIX Futures Contracts [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 5,330 | 14,200 |
|
Level I - Quoted Prices [Member] | ProShares Short Euro [Member] | Short-Term U.S. Government and Agencies [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 6,227,257 | 7,902,056 |
|
Level I - Quoted Prices [Member] | ProShares Short Euro [Member] | VIX Futures Contracts [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 47,900 | (33,231) |
|
Level I - Quoted Prices [Member] | ProShares UltraShort Australian Dollar [Member] | Short-Term U.S. Government and Agencies [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 19,227,467 | 24,198,507 |
|
Level I - Quoted Prices [Member] | ProShares UltraShort Australian Dollar [Member] | VIX Futures Contracts [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | (1,221,879) | 917,605 |
|
Level I - Quoted Prices [Member] | ProShares UltraShort Euro [Member] | Short-Term U.S. Government and Agencies [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 414,310,854 | 437,847,159 |
|
Level I - Quoted Prices [Member] | ProShares UltraShort Yen [Member] | Short-Term U.S. Government and Agencies [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 400,736,540 | 558,597,264 |
|
Level I - Quoted Prices [Member] | ProShares Ultra DJ-UBS Commodity [Member] | Short-Term U.S. Government and Agencies [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 2,410,896 | 2,816,688 |
|
Level I - Quoted Prices [Member] | ProShares Ultra DJ-UBS Crude Oil [Member] | Short-Term U.S. Government and Agencies [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 112,053,990 | 137,435,610 |
|
Level I - Quoted Prices [Member] | ProShares Ultra DJ-UBS Crude Oil [Member] | VIX Futures Contracts [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 2,109,314 | 626,661 |
|
Level I - Quoted Prices [Member] | ProShares Ultra DJ-UBS Natural Gas [Member] | Short-Term U.S. Government and Agencies [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 18,277,978 | 58,921,011 |
|
Level I - Quoted Prices [Member] | ProShares Ultra DJ-UBS Natural Gas [Member] | VIX Futures Contracts [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | (1,851,411) | (3,656,539) |
|
Level I - Quoted Prices [Member] | ProShares Ultra Gold [Member] | Short-Term U.S. Government and Agencies [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 148,339,252 | 140,880,950 |
|
Level I - Quoted Prices [Member] | ProShares Ultra Gold [Member] | VIX Futures Contracts [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | (16,860) | (14,560) |
|
Level I - Quoted Prices [Member] | ProShares Ultra Silver [Member] | Short-Term U.S. Government and Agencies [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 530,701,182 | 467,868,976 |
|
Level I - Quoted Prices [Member] | ProShares Ultra Silver [Member] | VIX Futures Contracts [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | (5,330) | (14,200) |
|
Level I - Quoted Prices [Member] | ProShares Ultra Australian Dollar [Member] | Short-Term U.S. Government and Agencies [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 2,775,892 | 2,716,439 |
|
Level I - Quoted Prices [Member] | ProShares Ultra Australian Dollar [Member] | VIX Futures Contracts [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 192,985 | (118,220) |
|
Level I - Quoted Prices [Member] | ProShares Ultra Euro [Member] | Short-Term U.S. Government and Agencies [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 2,307,737 | 2,455,863 |
|
Level I - Quoted Prices [Member] | ProShares Ultra Yen [Member] | Short-Term U.S. Government and Agencies [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 2,471,851 | 2,928,556 |
|
Level I - Quoted Prices [Member] | ProShares VIX Short-Term Futures ETF [Member] | Short-Term U.S. Government and Agencies [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 94,150,810 | 207,636,383 |
|
Level I - Quoted Prices [Member] | ProShares VIX Short-Term Futures ETF [Member] | VIX Futures Contracts [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | (5,026,965) | (16,652,686) |
|
Level I - Quoted Prices [Member] | ProShares VIX Mid-Term Futures ETF [Member] | Short-Term U.S. Government and Agencies [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 48,695,771 | 46,040,233 |
|
Level I - Quoted Prices [Member] | ProShares VIX Mid-Term Futures ETF [Member] | VIX Futures Contracts [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | (2,007,210) | (4,896,689) |
|
Level I - Quoted Prices [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member] | Short-Term U.S. Government and Agencies [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 173,853,508 | 109,533,487 |
|
Level I - Quoted Prices [Member] | ProShares Ultra VIX Short-Term Futures ETF [Member] | VIX Futures Contracts [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | (29,701,827) | (24,009,911) |
|
Level I - Quoted Prices [Member] | ProShares Short VIX Short-Term Futures ETF [Member] | Short-Term U.S. Government and Agencies [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 169,490,113 | 105,559,022 |
|
Level I - Quoted Prices [Member] | ProShares Short VIX Short-Term Futures ETF [Member] | VIX Futures Contracts [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 8,083,199 | 8,116,955 |
|
Level I - Quoted Prices [Member] | Total Trust [Member] | Short-Term U.S. Government and Agencies [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 2,666,559,183 | 2,846,465,825 |
|
Level I - Quoted Prices [Member] | Total Trust [Member] | VIX Futures Contracts [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | (31,160,888) | (39,896,568) |
|
Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort DJ-UBS Commodity [Member] | Swap Agreements [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 102,269 | (27,665) |
|
Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort DJ-UBS Crude Oil [Member] | Swap Agreements [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | (692,931) | (2,332,900) |
|
Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Gold [Member] | Forward Agreements [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 8,531,762 | 5,633,053 |
|
Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Silver [Member] | Forward Agreements [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 7,742,580 | (2,227,857) |
|
Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Euro [Member] | Foreign Currency Forward Contracts [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | (3,724,310) | (13,748,507) |
|
Level II - Other Significant Observable Inputs [Member] | ProShares UltraShort Yen [Member] | Foreign Currency Forward Contracts [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 4,846,384 | 29,386,684 |
|
Level II - Other Significant Observable Inputs [Member] | ProShares Ultra DJ-UBS Commodity [Member] | Swap Agreements [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | (114,128) | 15,078 |
|
Level II - Other Significant Observable Inputs [Member] | ProShares Ultra DJ-UBS Crude Oil [Member] | Swap Agreements [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 959,951 | 1,957,893 |
|
Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Gold [Member] | Forward Agreements [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | (12,010,072) | (6,812,974) |
|
Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Silver [Member] | Forward Agreements [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | (58,138,361) | (2,492,880) |
|
Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Euro [Member] | Foreign Currency Forward Contracts [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 20,984 | 100,962 |
|
Level II - Other Significant Observable Inputs [Member] | ProShares Ultra Yen [Member] | Foreign Currency Forward Contracts [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | (41,229) | (159,309) |
|
Level II - Other Significant Observable Inputs [Member] | Total Trust [Member] | Forward Agreements [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | (53,874,091) | (5,900,658) |
|
Level II - Other Significant Observable Inputs [Member] | Total Trust [Member] | Foreign Currency Forward Contracts [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | 1,101,829 | 15,579,830 |
|
Level II - Other Significant Observable Inputs [Member] | Total Trust [Member] | Swap Agreements [Member]
|
||
| Significant Accounting Policies [Line Items] | ||
| Investments, fair value disclosure | $ 255,161 | $ (387,594) |