Summary Of Significant Accounting Policies (Activity In Gold Bullion) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 oz	Dec. 31, 2010 oz	Dec. 31, 2009 oz
Summary Of Significant Accounting Policies [Abstract]
Beginning balance, Ounces	3,783,000	2,550,400	2,146,800
Gold contributed, Ounces	2,333,900	1,359,300	623,700
Gold distributed, Ounces	(606,800)	(117,600)	(211,100)
Gold sold, Ounces	(11,300)	(9,100)	(9,000)
Ending balance, Ounces	5,498,800	3,783,000	2,550,400
Beginning balance, Average Cost	$ 3,568,036	$ 1,914,867	$ 1,448,373
Gold contributed, Average Cost	3,660,287	1,748,964	625,072
Gold distributed, Average Cost	(644,033)	(88,442)	(152,323)
Gold sold, Average Cost	(12,188)	(7,353)	(6,255)
Ending balance, Average Cost	6,572,102	3,568,036	1,914,867
Beginning balance, Fair Value	5,317,017	2,793,239	1,896,894
Gold contributed, Fair Value	3,660,287	1,748,964	625,072
Gold distributed, Fair Value	(915,939)	(128,153)	(219,965)
Gold sold, Fair Value	(17,758)	(11,051)	(8,680)
Adjustment for realized gain, Fair Value	277,476	43,409	70,067
Adjustment for unrealized gain on gold bullion, Fair Value	97,656	870,609	429,851
Ending balance, Fair Value	8,418,739	5,317,017	2,793,239
Gold distributed, Realized Gain (Loss)	271,906	39,711	67,642
Gold sold, Realized Gain (Loss)	5,570	3,698	2,425
Ending balance, Realized Gain (Loss)	$ 277,476	$ 43,409	$ 70,067