Segment and Geographic Information - Summary of Total Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total assets	$ 301,069	$ 313,216
North America
Segment Reporting Information [Line Items]
Total assets	116,598	145,013
Europe
Segment Reporting Information [Line Items]
Total assets	51,876	61,329
Middle East
Segment Reporting Information [Line Items]
Total assets	70,308	72,984
Latin America
Segment Reporting Information [Line Items]
Total assets	55,661	23,891
Other
Segment Reporting Information [Line Items]
Total assets	6,626	9,999
Operating segments | E&P Technology & Services
Segment Reporting Information [Line Items]
Total assets	156,555	159,965
Operating segments | E&P Operations Optimization
Segment Reporting Information [Line Items]
Total assets	74,361	76,992
Operating segments | Ocean Bottom Seismic Services
Segment Reporting Information [Line Items]
Total assets	20,828	29,908
Support and other
Segment Reporting Information [Line Items]
Total assets	$ 49,325	$ 46,351