Business Segment Information - Summary Of Financial Data By Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Net revenues	$ 104,528	$ 91,039
Income (loss) from operations	(17,705)	(30,756)
Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues	(8,436)	(5,493)
Income (loss) from operations	221	168
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	(9,962)	(8,669)
Well Intervention [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Net revenues	74,621	46,056
Income (loss) from operations	1,418	(16,688)
Well Intervention [Member] | Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues	(1,373)	(641)
Robotics [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Net revenues	21,968	31,994
Income (loss) from operations	(16,306)	(12,750)
Robotics [Member] | Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues	(7,063)	(4,852)
Production Facilities [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Net revenues	16,375	18,482
Income (loss) from operations	$ 6,924	$ 7,183