Business Segment Information - Summary of Intercompany Segment Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Net revenues	$ (161,245)	$ (182,462)	$ (359,551)	$ (538,119)
Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues	13,067	14,876	29,083	42,895
Intercompany Elimination [Member] | Well Intervention [Member]
Segment Reporting Information [Line Items]
Net revenues	2,898	7,324	5,740	18,687
Intercompany Elimination [Member] | Robotics [Member]
Segment Reporting Information [Line Items]
Net revenues	$ 10,169	$ 7,552	$ 23,343	$ 24,208