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Acquisition of OceanGeo - Narrative (Details) - OceanGeo [Member] - USD ($)
1 Months Ended 12 Months Ended
Jul. 31, 2014
Dec. 31, 2014
Dec. 31, 2015
Jan. 31, 2014
Oct. 31, 2013
Feb. 28, 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     $ 40,500,000   $ 18,900,000  
Total consideration $ 6,000,000          
Acquisition related costs   $ 1,300,000