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Schedule of Investments
$ in Thousands
Sep. 30, 2015
USD ($)
oz
Dec. 31, 2014
USD ($)
oz
Investment Holdings [Line Items]    
Investment in Bullion (oz) | oz 2,767,862.6 4,225,571.5
Cost $ 156,748 $ 242,403
Fair Value $ 138,716 $ 234,158
% of Net Assets 100.05% 98.74%
Gold [Member]    
Investment Holdings [Line Items]    
Investment in Bullion (oz) | oz 72,838.6 111,199.3
Cost $ 86,647 $ 133,156
Fair Value $ 81,143 $ 133,356
% of Net Assets 58.52% 56.23%
Silver [Member]    
Investment Holdings [Line Items]    
Investment in Bullion (oz) | oz 2,670,744.7 4,077,306.0
Cost $ 47,183 $ 73,612
Fair Value $ 39,126 $ 65,115
% of Net Assets 28.22% 27.46%
Platinum [Member]    
Investment Holdings [Line Items]    
Investment in Bullion (oz) | oz 9,711.7 14,826.5
Cost $ 12,229 $ 19,160
Fair Value $ 8,818 $ 17,940
% of Net Assets 6.36% 7.56%
Palladium [Member]    
Investment Holdings [Line Items]    
Investment in Bullion (oz) | oz 14,567.6 22,239.7
Cost $ 10,689 $ 16,475
Fair Value $ 9,629 $ 17,747
% of Net Assets 6.94% 7.48%