Creation and Redemption of Creation Units - Schedule of Transaction Fees (Detail) - USD ($)		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Creation And Redemption Of Creation Units [Line Items]
Transaction fees	[1]	$ 3,906,425	$ 3,193,283	$ 1,805,044
ProShares VIX Short-Term Futures ETF [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		229,699	105,024	72,020
ProShares VIX Mid-Term Futures ETF [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		24,056	8,521	8,927
ProShares Short VIX Short-Term Futures ETF [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		801,564	342,734	218,121
ProShares Ultra VIX Short-Term Futures ETF [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		1,822,247	1,391,292	734,298
ProShares UltraShort Bloomberg Crude Oil [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		398,027	382,054	257,458
ProShares UltraShort Bloomberg Natural Gas [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		8,989	8,853	26,053
ProShares UltraShort Gold [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		29,854	11,024	32,473
ProShares UltraShort Silver [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		16,729	39,354	48,832
ProShares Ultra Bloomberg Crude Oil [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		504,533	847,422	299,493
ProShares Ultra Bloomberg Natural Gas [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		9,175	13,939	30,073
ProShares Ultra Gold [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		14,138	4,218	12,088
ProShares Ultra Silver [Member]
Creation And Redemption Of Creation Units [Line Items]
Transaction fees		$ 47,414	$ 38,848	$ 65,208

[1] Amounts exclude the activity of ProShares Ultra Australian Dollar which liquidated on June 29, 2015, ProShares Managed Futures Strategy which liquidated on March 30, 2016, ProShares UltraShort Bloomberg Commodity and ProShares Ultra Bloomberg Commodity which liquidated on September 1, 2016.