Business Segment Information - Summary of Intercompany Segment Revenues (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net revenues	$ (157,683)	$ (182,462)	$ (166,016)	$ (189,641)	$ (207,160)	$ (340,837)	$ (305,587)	$ (253,572)	$ (695,802)	$ (1,107,156)	$ (876,561)
Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues									54,473	74,450	68,607
Intercompany Elimination [Member] | Well Intervention [Member]
Segment Reporting Information [Line Items]
Net revenues									22,855	29,875	22,448
Intercompany Elimination [Member] | Robotics [Member]
Segment Reporting Information [Line Items]
Net revenues									31,618	44,575	41,169
Intercompany Elimination [Member] | Production Facilities [Member]
Segment Reporting Information [Line Items]
Net revenues									0	0	4,673
Intercompany Elimination [Member] | Subsea Construction [Member]
Segment Reporting Information [Line Items]
Net revenues									$ 0	$ 0	$ 317