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Revenue Participation Rights - Additional Information (Detail) (USD $)
 6 Months Ended 1 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
"Cambridge" Project [Member]
Dec. 31, 2012
"Cambridge" Project [Member]
Jun. 30, 2013
"Republic" (now "Seattle") Project [Member]
Dec. 31, 2012
"Republic" (now "Seattle") Project [Member]
Jun. 30, 2013
Galt Resources, LLC [Member]
Jun. 30, 2013
Galt Resources, LLC [Member]
SS Gairsoppa [Member]
Feb. 28, 2011
Galt Resources, LLC [Member]
Maximum [Member]
Jun. 30, 2013
First Payment [Member]
"Cambridge" Project [Member]
Jun. 30, 2013
Second Payment [Member]
"Cambridge" Project [Member]
Jun. 30, 2013
Second Payment [Member]
"Cambridge" Project [Member]
Minimum [Member]
Jun. 30, 2013
Second Payment [Member]
"Cambridge" Project [Member]
Maximum [Member]
Jun. 30, 2013
Third Payment [Member]
"Cambridge" Project [Member]
Deferred Revenue Arrangement [Line Items]                            
Revenue Participation Certificates, per unit value     50,000   50,000                  
Percentage of revenue owed to certificate holders 7.5125%           50.00%     100.00% 24.75%     12.375%
Revenue owed to certificate holder                   $ 825,000   $ 4,000,000 $ 35,000,000 $ 35,000,000
Percentage of revenue owed to certificate holder, per each million invested         1.00%   1.00%              
Common shares, issued, per unit         100,000                  
Investment for future revenue rights                 7,512,500          
Percentage of additional net revenue owed to certificate holders             1.00%              
Participating revenue rights 4,643,750 4,643,750 825,000 825,000 62,500 62,500   12,506,755            
Ratio to initial investment 2                          
Distributions from the Gairsoppa project proceeds             $ 0