Business Segment Information - Summary Of Financial Data By Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Net revenues	$ 212,575	$ 163,260	$ 581,462	$ 418,117
Income (loss) from operations	31,377	4,767	55,033	(7,888)
Corporate and Other
Segment Reporting Information [Line Items]
Income (loss) from operations	(15,567)	(10,633)	(36,507)	(29,296)
Intercompany Elimination
Segment Reporting Information [Line Items]
Net revenues	(12,083)	(11,691)	(33,417)	(31,145)
Income (loss) from operations	222	199	665	641
Well Intervention | Reportable Segments
Segment Reporting Information [Line Items]
Net revenues	154,441	111,522	445,769	299,219
Income (loss) from operations	34,427	16,906	82,774	37,356
Well Intervention | Intercompany Elimination
Segment Reporting Information [Line Items]
Net revenues	(4,379)	(3,765)	(10,546)	(8,033)
Robotics | Reportable Segments
Segment Reporting Information [Line Items]
Net revenues	54,340	47,049	120,569	102,078
Income (loss) from operations	5,601	(9,365)	(12,818)	(37,313)
Robotics | Intercompany Elimination
Segment Reporting Information [Line Items]
Net revenues	(7,704)	(7,926)	(22,871)	(23,112)
Production Facilities | Reportable Segments
Segment Reporting Information [Line Items]
Net revenues	15,877	16,380	48,541	47,965
Income (loss) from operations	$ 6,694	$ 7,660	$ 20,919	$ 20,724