Business Segment Information - Financial Data By Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Net revenues	$ 161,941	$ 199,147	$ 325,356	$ 380,168
Goodwill impairment				(6,689)
Income from operations	(10,941)	14,194	(11,496)	(6,833)
Reportable Segments
Segment Reporting Information [Line Items]
Income from operations	(1,782)	22,904	7,041	18,031
Intercompany Eliminations
Segment Reporting Information [Line Items]
Net revenues	(16,233)	(11,123)	(25,189)	(21,553)
Corporate, Eliminations and Other
Segment Reporting Information [Line Items]
Income from operations	(9,159)	(8,710)	(18,537)	(18,175)
Well Intervention
Segment Reporting Information [Line Items]
Net revenues	132,305	145,841	266,073	286,493
Well Intervention | Reportable Segments
Segment Reporting Information [Line Items]
Net revenues	132,305	145,841	266,073	286,493
Income from operations	(6,719)	11,758	(1,476)	6,066
Well Intervention | Intercompany Eliminations
Segment Reporting Information [Line Items]
Net revenues	(10,206)	(3,910)	(12,793)	(7,214)
Robotics
Segment Reporting Information [Line Items]
Net revenues	31,651	50,836	53,807	86,094
Robotics | Reportable Segments
Segment Reporting Information [Line Items]
Net revenues	31,651	50,836	53,807	86,094
Income from operations	255	7,781	(2,679)	4,957
Robotics | Intercompany Eliminations
Segment Reporting Information [Line Items]
Net revenues	(6,027)	(7,213)	(12,396)	(14,339)
Production Facilities
Segment Reporting Information [Line Items]
Net revenues	14,218	13,593	30,665	29,134
Production Facilities | Reportable Segments
Segment Reporting Information [Line Items]
Net revenues	14,218	13,593	30,665	29,134
Income from operations	$ 4,682	$ 3,365	$ 11,196	$ 7,008