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Segment Reporting (Details) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2012
Jan. 31, 2012
Segment Reporting Information [Line Items]    
Consolidated $ 193,282 $ 198,229
Equipment Leasing [Member]
   
Segment Reporting Information [Line Items]    
Consolidated 174,059 172,238
Seamap [Member]
   
Segment Reporting Information [Line Items]    
Consolidated 19,475 26,322
Eliminations [Member]
   
Segment Reporting Information [Line Items]    
Consolidated $ (252) $ (331)