v2.4.0.6

Organization - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013 D Trust
Organization [Line Items]
Number of series of Trust	21
Number of additional series	3
Number of shares of each Leveraged Fund	14
Aggregate purchase price of each Leveraged Fund	$ 350
Number of days for expected multiple returns	1
ProShares UltraShort DJ-UBS Commodity [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares UltraShort DJ-UBS 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 DJ-UBS Commodity [Member]
Organization [Line Items]
Aggregate purchase price of each Leveraged Fund	350
ProShares Ultra DJ-UBS 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

X

- Definition

Aggregate Purchase of Each Fund

+ References

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+ Details

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Namespace Prefix:	ck0001415311_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Number Of Additional Series

+ References

No definition available.

+ Details

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Namespace Prefix:	ck0001415311_
Data Type:	xbrli:positiveIntegerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number Of Days For Expected Multiple Returns

+ References

No definition available.

+ Details

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Namespace Prefix:	ck0001415311_
Data Type:	xbrli:positiveIntegerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number Of Series

+ References

No definition available.

+ Details

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Namespace Prefix:	ck0001415311_
Data Type:	xbrli:positiveIntegerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of Shares of Each Fund

+ References

No definition available.

+ Details

Name:	ck0001415311_NumberOfSharesOfEachFund
Namespace Prefix:	ck0001415311_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Data Type:	xbrli:stringItemType
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