Business Segment Information - Financial Data by Reportable Segment (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
Income (loss) from operations	(9,295)	7,674	(40,051)	30,002
Reportable Segments [Member] | Well Intervention [Member]
Segment Reporting Information [Line Items]
Net revenues	59,919	85,675	105,975	189,726
Income (loss) from operations	(538)	4,135	(17,226)	18,929
Reportable Segments [Member] | Robotics [Member]
Segment Reporting Information [Line Items]
Net revenues	38,914	75,101	70,908	155,272
Income (loss) from operations	(8,823)	4,303	(21,573)	13,760
Reportable Segments [Member] | Production Facilities [Member]
Segment Reporting Information [Line Items]
Net revenues	18,957	20,293	37,439	38,678
Income (loss) from operations	9,730	8,444	16,913	13,022
Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues	(10,523)	(15,053)	(16,016)	(28,019)
Income (loss) from operations	163	(199)	331	(93)
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)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	$ (9,827)	$ (9,009)	$ (18,496)	$ (15,616)