Business Segment Information - Financial Data by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Net revenues	$ 91,039	$ 189,641
Income (loss) from operations	(30,756)	22,328
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations		(6,607)
Reportable Segments [Member] | Well Intervention [Member]
Segment Reporting Information [Line Items]
Net revenues	46,056	104,051
Income (loss) from operations	(16,688)	14,794
Reportable Segments [Member] | Robotics [Member]
Segment Reporting Information [Line Items]
Net revenues	31,994	80,171
Income (loss) from operations	(12,750)	9,457
Reportable Segments [Member] | Production Facilities [Member]
Segment Reporting Information [Line Items]
Net revenues	18,482	18,385
Income (loss) from operations	7,183	4,578
Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues	(5,493)	(12,966)
Income (loss) from operations	168	106
Intercompany Elimination [Member] | Well Intervention [Member]
Segment Reporting Information [Line Items]
Net revenues	(641)	(4,946)
Intercompany Elimination [Member] | Robotics [Member]
Segment Reporting Information [Line Items]
Net revenues	(4,852)	$ (8,020)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	$ (8,669)