Business Segment Information - Summary Of Financial Data By Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net revenues	$ 170,749	$ 212,609	$ 201,728	$ 166,823	$ 158,356	$ 212,575	$ 204,625	$ 164,262	$ 751,909	$ 739,818	$ 581,383
Income (loss) from operations									67,997	51,543	(1,130)
Net interest expense									8,333	13,751	18,778
Other non-operating income (expense), net									5,892	(6,794)	(464)
Income (loss) before income taxes									65,556	30,998	(20,372)
Capital expenditures									140,854	137,083	231,127
Depreciation and amortization									112,720	110,522	108,745
Reportable Segments
Segment Reporting Information [Line Items]
Income (loss) from operations									113,985	100,852	38,616
Intercompany Eliminations
Segment Reporting Information [Line Items]
Net revenues									(74,273)	(44,139)	(42,065)
Corporate, Eliminations and Other
Segment Reporting Information [Line Items]
Income (loss) from operations									(45,988)	(49,309)	(39,746)
Capital expenditures									1,102	443	125
Depreciation and amortization									450	334	2,882
Well Intervention
Segment Reporting Information [Line Items]
Net revenues									593,300	560,568
Well Intervention | Reportable Segments
Segment Reporting Information [Line Items]
Net revenues									593,300	560,568	406,341
Income (loss) from operations									89,564	87,643	52,733
Capital expenditures									139,212	136,164	230,354
Depreciation and amortization									80,153	76,943	68,301
Well Intervention | Intercompany Eliminations
Segment Reporting Information [Line Items]
Net revenues									(43,484)	(14,218)	(11,489)
Robotics
Segment Reporting Information [Line Items]
Net revenues									171,672	158,989
Robotics | Reportable Segments
Segment Reporting Information [Line Items]
Net revenues									171,672	158,989	152,755
Income (loss) from operations									7,261	(14,054)	(42,289)
Capital expenditures									417	151	648
Depreciation and amortization									16,459	19,175	23,626
Robotics | Intercompany Eliminations
Segment Reporting Information [Line Items]
Net revenues									(30,789)	(29,921)	(30,576)
Production Facilities
Segment Reporting Information [Line Items]
Net revenues									61,210	64,400
Production Facilities | Reportable Segments
Segment Reporting Information [Line Items]
Net revenues									61,210	64,400	64,352
Income (loss) from operations									17,160	27,263	28,172
Capital expenditures									123	325	0
Depreciation and amortization									$ 15,658	$ 14,070	$ 13,936