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Significant Accounting Policies (Detail) - Schedule of Investment in Palladium (Parentheticals) (USD $)	Jun. 30, 2012 oz		Dec. 31, 2011 oz
Palladium Payable Ounces Of Palladium	19,704.3		0
Palladium Payable (in Dollars)	$ 11,389,069	[1]	$ 0	[1]
[1] Cost of palladium payable at June 30, 2012 - $12,289,756.

X

- Definition

Amount of palladium payable at lower of cost or market value as of the reporting date.

+ References

No definition available.

+ Details

Name:	pall_PalladiumPayableAtLowerOfCostOrMarketValue
Namespace Prefix:	pall_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Ounces of palladium payable by the Trust.

+ References

No definition available.

+ Details

Name:	pall_PalladiumPayableOuncesOfPalladium
Namespace Prefix:	pall_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	instant