Business Segment Information - Summary Of Financial Data By Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net revenues	$ 159,897	$ 193,490	$ 199,147	$ 181,021	$ 170,749	$ 212,609	$ 201,728	$ 166,823	$ 733,555	$ 751,909	$ 739,818
Income (loss) from operations									13,025	67,997	51,543
Goodwill impairment									(6,689)	0	0
Net interest expense									(28,531)	(8,333)	(13,751)
Other non-operating income (expense), net									16,889	5,892	(6,794)
Income before income taxes									1,383	65,556	30,998
Capital expenditures									20,244	140,854	137,083
Depreciation and amortization									133,709	112,720	110,522
Reportable Segments
Segment Reporting Information [Line Items]
Income (loss) from operations									56,585	113,985	100,852
Intercompany Eliminations
Segment Reporting Information [Line Items]
Net revenues									(42,015)	(74,273)	(44,139)
Corporate, Eliminations and Other
Segment Reporting Information [Line Items]
Income (loss) from operations									(36,871)	(45,988)	(49,309)
Capital expenditures									464	1,102	443
Depreciation and amortization									349	450	334
Well Intervention
Segment Reporting Information [Line Items]
Net revenues									539,249	593,300	560,568
Goodwill impairment									(6,689)
Well Intervention | Reportable Segments
Segment Reporting Information [Line Items]
Net revenues									539,249	593,300	560,568
Income (loss) from operations									26,855	89,564	87,643
Capital expenditures									19,523	139,212	136,164
Depreciation and amortization									101,756	80,153	76,943
Well Intervention | Intercompany Eliminations
Segment Reporting Information [Line Items]
Net revenues									(15,039)	(43,484)	(14,218)
Robotics
Segment Reporting Information [Line Items]
Net revenues									178,018	171,672	158,989
Robotics | Reportable Segments
Segment Reporting Information [Line Items]
Net revenues									178,018	171,672	158,989
Income (loss) from operations									13,755	7,261	(14,054)
Capital expenditures									257	417	151
Depreciation and amortization									15,952	16,459	19,175
Robotics | Intercompany Eliminations
Segment Reporting Information [Line Items]
Net revenues									(26,976)	(30,789)	(29,921)
Production Facilities
Segment Reporting Information [Line Items]
Net revenues									58,303	61,210	64,400
Production Facilities | Reportable Segments
Segment Reporting Information [Line Items]
Net revenues									58,303	61,210	64,400
Income (loss) from operations									15,975	17,160	27,263
Capital expenditures									0	123	325
Depreciation and amortization									$ 15,652	$ 15,658	$ 14,070