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Schedule of Investments
$ in Thousands
Jun. 30, 2015
USD ($)
oz
Dec. 31, 2014
USD ($)
oz
Investment Holdings [Line Items]    
Investment in Bullion (oz) | oz 2,716,603.2 4,225,571.5
Cost $ 155,434 $ 242,403
Fair Value $ 144,823 $ 234,158
% of Net Assets 100.05% 98.74%
Gold [Member]    
Investment Holdings [Line Items]    
Investment in Bullion (oz) | oz 71,489.6 111,199.3
Cost $ 85,594 $ 133,156
Fair Value $ 83,714 $ 133,356
% of Net Assets 57.83% 56.23%
Silver [Member]    
Investment Holdings [Line Items]    
Investment in Bullion (oz) | oz 2,621,283.9 4,077,306.0
Cost $ 46,976 $ 73,612
Fair Value $ 41,154 $ 65,115
% of Net Assets 28.43% 27.46%
Platinum [Member]    
Investment Holdings [Line Items]    
Investment in Bullion (oz) | oz 9,531.9 14,826.5
Cost $ 12,225 $ 19,160
Fair Value $ 10,275 $ 17,940
% of Net Assets 7.10% 7.56%
Palladium [Member]    
Investment Holdings [Line Items]    
Investment in Bullion (oz) | oz 14,297.8 22,239.7
Cost $ 10,639 $ 16,475
Fair Value $ 9,680 $ 17,747
% of Net Assets 6.69% 7.48%