Company Overview (Details)		6 Months Ended
	Feb. 01, 2017	Jun. 30, 2017 segment vessel
Segment Reporting Information [Line Items]
Number of reportable segments | segment		3
Robotics [Member]
Segment Reporting Information [Line Items]
Number of chartered vessels | vessel		4
HFRS [Member] | Production Facilities [Member]
Segment Reporting Information [Line Items]
Contract extension period	1 year