Segment and Geographic Information - Depreciation and Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Depreciation and amortization (including multi-client data library):	$ 57,751	$ 63,694	$ 55,310
Operating segments | E&P Technology & Services
Segment Reporting Information [Line Items]
Depreciation and amortization (including multi-client data library):	51,673	53,663	44,100
Operating segments | Operations Optimization
Segment Reporting Information [Line Items]
Depreciation and amortization (including multi-client data library):	995	1,349	1,780
Operating segments | Ocean Bottom Integrated Technologies
Segment Reporting Information [Line Items]
Depreciation and amortization (including multi-client data library):	4,231	7,001	7,511
Support and other
Segment Reporting Information [Line Items]
Depreciation and amortization (including multi-client data library):	$ 852	$ 1,681	$ 1,919