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Statement of Changes in Shareholders' Deficit (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Statement of Changes in Shareholders' Deficit [Abstract]      
Shareholders’ deficit - opening balance $ (52,982) [1]    
Net loss for the period (92) (632)  
Adjustment of redeemable Shares to redemption value (50,127)   (27,685)
Shareholders’ deficit – closing balance $ (103,201)   $ (52,982) [1]
[1] Derived from audited Statement of Financial Condition as of December 31, 2012.