Operations by Business Segment and Geographic Area Operations by Business Segment and Geographic Areas - Schedule of Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 2,824,998	$ 3,023,950
Property, Plant and Equipment, Net	964,670	1,064,204
Goodwill	413,121	455,599
Oil And Gas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	2,189,926	2,334,264
Property, Plant and Equipment, Net	943,510	1,041,668
Goodwill	391,279	433,757
ROVs [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	612,983	650,832
Property, Plant and Equipment, Net	353,139	420,088
Goodwill	24,396	24,777
Subsea Products [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	723,774	788,586
Property, Plant and Equipment, Net	295,297	329,486
Goodwill	99,744	103,128
Subsea Projects [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	611,476	626,791
Property, Plant and Equipment, Net	274,518	272,649
Goodwill	123,624	155,292
Asset Integrity [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	241,693	268,055
Property, Plant and Equipment, Net	20,556	19,445
Goodwill	143,515	150,560
Advanced Technologies [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	168,302	129,185
Property, Plant and Equipment, Net	11,229	10,850
Goodwill	21,842	21,842
Corporate and Other [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	466,770	560,501
Property, Plant and Equipment, Net	9,931	11,686
NORWAY
Segment Reporting, Asset Reconciling Item [Line Items]
Property, Plant and Equipment, Net	58,042	78,279
Africa [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Property, Plant and Equipment, Net	117,877	135,345
UNITED KINGDOM
Segment Reporting, Asset Reconciling Item [Line Items]
Property, Plant and Equipment, Net	106,330	87,601
Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Property, Plant and Equipment, Net	48,837	50,057
BRAZIL
Segment Reporting, Asset Reconciling Item [Line Items]
Property, Plant and Equipment, Net	51,282	50,842
Segment, Geographical, Groups of Countries, Group Three [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Property, Plant and Equipment, Net	21,374	25,346
Segment, Geographical, Groups of Countries, Foreign [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Property, Plant and Equipment, Net	403,742	427,470
UNITED STATES
Segment Reporting, Asset Reconciling Item [Line Items]
Property, Plant and Equipment, Net	$ 560,928	$ 636,734