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Sale of MSE Sale of MSE (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2018
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2018
Oct. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Loss on sale subsidiary   $ 4,905 $ 0 $ 4,905 $ 0
Cumulative translation loss   $ (5,355) $ 0 $ (5,355) $ 0
Mitcham Seismic Eurasia LLC | Disposal Group, Disposed of by Sale, Not Discontinued Operations          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale of subsidiaries $ 1,200        
Interest rate on payments due from sale of subsidiary 9.00%        
Loss on sale subsidiary $ 4,900        
Cumulative translation loss $ 5,400