Organization - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 USD ($) Trust shares
Organization [Line Items]
Number of series of Trust | Trust	18
Number of shares of each Leveraged Fund | shares	14
Aggregate purchase price of each Leveraged Fund	$ 350
Period for expected multiple returns	1 day
ProShares UltraShort Bloomberg Crude Oil [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	$ 350
ProShares UltraShort Gold [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares UltraShort Silver [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares UltraShort Euro [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares UltraShort Yen [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares Ultra Bloomberg Crude Oil [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares Ultra Gold [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares Ultra Silver [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares Ultra Euro [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares Ultra Yen [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	$ 350