Revenue From Contracts With Customers - Schedule Of Disaggregated Revenue (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
Disaggregation of Revenue [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
Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net revenues									(74,273)	(44,139)	(42,065)
Well Intervention
Disaggregation of Revenue [Line Items]
Net revenues									593,300	560,568
Well Intervention | Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net revenues									(43,484)	(14,218)	(11,489)
Robotics
Disaggregation of Revenue [Line Items]
Net revenues									171,672	158,989
Robotics | Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net revenues									(30,789)	(29,921)	$ (30,576)
Production Facilities
Disaggregation of Revenue [Line Items]
Net revenues									61,210	64,400
Short-term
Disaggregation of Revenue [Line Items]
Net revenues									309,427	288,366
Short-term | Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net revenues									0	0
Short-term | Well Intervention
Disaggregation of Revenue [Line Items]
Net revenues									214,926	199,294
Short-term | Robotics
Disaggregation of Revenue [Line Items]
Net revenues									94,501	89,072
Short-term | Production Facilities
Disaggregation of Revenue [Line Items]
Net revenues									0	0
Long-term
Disaggregation of Revenue [Line Items]
Net revenues									442,482	451,452
Long-term | Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net revenues									(74,273)	(44,139)
Long-term | Well Intervention
Disaggregation of Revenue [Line Items]
Net revenues									378,374	361,274
Long-term | Robotics
Disaggregation of Revenue [Line Items]
Net revenues									77,171	69,917
Long-term | Production Facilities
Disaggregation of Revenue [Line Items]
Net revenues									$ 61,210	$ 64,400