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Acquisition of OceanGeo - Narrative (Details) - OceanGeo [Member] - USD ($)
Jul. 31, 2014
Jan. 31, 2014
Dec. 31, 2013
Oct. 31, 2013
Business Acquisition [Line Items]        
Increase in ownership percentage 30.00% 40.00% 30.00%  
Percentage of ownership interest 100.00% 70.00%    
Maximum advance capacity       $ 25,000,000.0
Working capital loan to investee       $ 18,900,000