Company Overview (Details)	1 Months Ended	6 Months Ended
	Feb. 28, 2014 vessel	Jun. 30, 2015 segment vessel
Segment Reporting Information [Line Items]
Number of reportable segments | segment		3
Robotics [Member]
Segment Reporting Information [Line Items]
Number of chartered vessels		5
Monohull Vessels [Member]
Segment Reporting Information [Line Items]
Number of vessels under construction	2
Monohull Vessels [Member] | Well Intervention [Member]
Segment Reporting Information [Line Items]
Number of vessels under construction		2