Business Segment Information - Financial Data By Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Net revenues	$ 163,415	$ 181,021
Goodwill impairment		(6,689)
Income from operations	(555)	(21,027)
Reportable Segments
Segment Reporting Information [Line Items]
Income from operations	8,823	(4,873)
Intercompany Eliminations
Segment Reporting Information [Line Items]
Net revenues	(8,956)	(10,430)
Corporate, Eliminations and Other
Segment Reporting Information [Line Items]
Income from operations	(9,378)	(9,465)
Well Intervention
Segment Reporting Information [Line Items]
Net revenues	133,768	140,652
Well Intervention | Reportable Segments
Segment Reporting Information [Line Items]
Net revenues	133,768	140,652
Income from operations	5,243	(5,692)
Well Intervention | Intercompany Eliminations
Segment Reporting Information [Line Items]
Net revenues	(2,587)	(3,304)
Robotics
Segment Reporting Information [Line Items]
Net revenues	22,156	35,258
Robotics | Reportable Segments
Segment Reporting Information [Line Items]
Net revenues	22,156	35,258
Income from operations	(2,934)	(2,824)
Robotics | Intercompany Eliminations
Segment Reporting Information [Line Items]
Net revenues	(6,369)	(7,126)
Production Facilities
Segment Reporting Information [Line Items]
Net revenues	16,447	15,541
Production Facilities | Reportable Segments
Segment Reporting Information [Line Items]
Net revenues	16,447	15,541
Income from operations	$ 6,514	$ 3,643