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Acquisition of OceanGeo - Assets and Liabilities Assumed (Details) (OceanGeo [Member], USD $)
In Thousands, unless otherwise specified
0 Months Ended
Jan. 31, 2014
OceanGeo [Member]
 
Business Acquisition [Line Items]  
Cash and cash equivalents $ 609
Accounts receivable 9,247
Prepaid expenses and other current assets 1,433
Property, plant, equipment and seismic rental equipment, net 18,474
Other assets 2,227
Total identifiable assets 31,990
Accounts payable and accrued liabilities (13,464)
Bank loans (6,135)
Other liabilities (1,026)
Net assets 11,365
Noncontrolling interest (3,410)
Total consideration $ 7,955