Revenue From Contracts With Customers - Schedule Of Disaggregated Revenue (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
Disaggregation of Revenue [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
Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net revenues									(42,015)	(74,273)	(44,139)
Well Intervention
Disaggregation of Revenue [Line Items]
Net revenues									539,249	593,300	560,568
Well Intervention | Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net revenues									(15,039)	(43,484)	(14,218)
Robotics
Disaggregation of Revenue [Line Items]
Net revenues									178,018	171,672	158,989
Robotics | Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net revenues									(26,976)	(30,789)	(29,921)
Production Facilities
Disaggregation of Revenue [Line Items]
Net revenues									58,303	61,210	64,400
Short-term
Disaggregation of Revenue [Line Items]
Net revenues									324,251	309,427	288,366
Short-term | Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net revenues									0	0	0
Short-term | Well Intervention
Disaggregation of Revenue [Line Items]
Net revenues									206,812	214,926	199,294
Short-term | Robotics
Disaggregation of Revenue [Line Items]
Net revenues									117,439	94,501	89,072
Short-term | Production Facilities
Disaggregation of Revenue [Line Items]
Net revenues									0	0	0
Long-term
Disaggregation of Revenue [Line Items]
Net revenues									409,304	442,482	451,452
Long-term | Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net revenues									(42,015)	(74,273)	(44,139)
Long-term | Well Intervention
Disaggregation of Revenue [Line Items]
Net revenues									332,437	378,374	361,274
Long-term | Robotics
Disaggregation of Revenue [Line Items]
Net revenues									60,579	77,171	69,917
Long-term | Production Facilities
Disaggregation of Revenue [Line Items]
Net revenues									$ 58,303	$ 61,210	$ 64,400