Details of Selected Balance Sheet Accounts - Property, Plant and Equipment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant, equipment and seismic rental equipment		$ 183,228,000
Property, plant, equipment and seismic rental equipment	$ 184,692,000
Less: accumulated depreciation	134,951,000
Less: accumulated depreciation		(133,634,000)
Less: impairment of long-lived assets	0	(36,553,000)	$ 0
Property, plant, equipment and seismic rental equipment, net	13,188,000
Property, plant, equipment and seismic rental equipment, net		13,041,000
Depreciation and amortization under capital leases	3,100,000	7,600,000	$ 15,200,000
Buildings
Property, Plant and Equipment [Line Items]
Property, plant, equipment and seismic rental equipment	15,486,000	15,707,000
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant, equipment and seismic rental equipment		132,135,000
Property, plant, equipment and seismic rental equipment	133,048,000
Seismic rental equipment
Property, Plant and Equipment [Line Items]
Property, plant, equipment and seismic rental equipment	1,669,000	1,423,000
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant, equipment and seismic rental equipment	3,347,000	3,859,000
Other
Property, Plant and Equipment [Line Items]
Property, plant, equipment and seismic rental equipment	$ 31,142,000	$ 30,104,000