Business Segment Information - Summary of Intercompany Segment Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Net revenues	$ (107,267)	$ (166,016)	$ (198,306)	$ (355,657)
Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues	10,523	15,053	16,016	28,019
Intercompany Elimination [Member] | Well Intervention [Member]
Segment Reporting Information [Line Items]
Net revenues	2,201	6,417	2,842	11,363
Intercompany Elimination [Member] | Robotics [Member]
Segment Reporting Information [Line Items]
Net revenues	$ 8,322	$ 8,636	$ 13,174	$ 16,656