Revenue From Contracts With Customers - Disaggregation Of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Net revenues	$ 163,415	$ 181,021
Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net revenues	(8,956)	(10,430)
Well Intervention
Disaggregation of Revenue [Line Items]
Net revenues	133,768	140,652
Well Intervention | Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net revenues	(2,587)	(3,304)
Robotics
Disaggregation of Revenue [Line Items]
Net revenues	22,156	35,258
Robotics | Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net revenues	(6,369)	(7,126)
Production Facilities
Disaggregation of Revenue [Line Items]
Net revenues	16,447	15,541
Short-term
Disaggregation of Revenue [Line Items]
Net revenues	58,624	104,765
Short-term | Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net revenues	0	0
Short-term | Well Intervention
Disaggregation of Revenue [Line Items]
Net revenues	49,217	82,324
Short-term | Robotics
Disaggregation of Revenue [Line Items]
Net revenues	9,407	22,441
Short-term | Production Facilities
Disaggregation of Revenue [Line Items]
Net revenues	0	0
Long-term
Disaggregation of Revenue [Line Items]
Net revenues	104,791	76,256
Long-term | Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Net revenues	(8,956)	(10,430)
Long-term | Well Intervention
Disaggregation of Revenue [Line Items]
Net revenues	84,551	58,328
Long-term | Robotics
Disaggregation of Revenue [Line Items]
Net revenues	12,749	12,817
Long-term | Production Facilities
Disaggregation of Revenue [Line Items]
Net revenues	$ 16,447	$ 15,541