Operations by Business Segment and Geographic Area Operations by Business Segment and Geographic Areas - Schedule of Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 3,130,315	$ 3,429,536
Property, Plant and Equipment, Net	1,153,258	1,266,731
Goodwill	443,551	426,872
Oil And Gas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	2,459,634	2,808,016
Property, Plant and Equipment, Net	1,127,991	1,241,411
Goodwill	421,709	405,030
ROVs [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	755,894	951,001
Property, Plant and Equipment, Net	485,063	580,315
Goodwill	24,406	24,344
Subsea Products [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	833,919	890,041
Property, Plant and Equipment, Net	344,973	348,042
Goodwill	99,336	88,279
Subsea Projects [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	608,411	671,019
Property, Plant and Equipment, Net	273,384	277,695
Goodwill	154,823	149,389
Asset Integrity [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	261,410	295,955
Property, Plant and Equipment, Net	24,571	35,359
Goodwill	143,144	143,018
Advanced Technologies [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	101,756	97,764
Property, Plant and Equipment, Net	12,057	12,614
Goodwill	21,842	21,842
Corporate and Other [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	568,925	523,756
Property, Plant and Equipment, Net	$ 13,210	$ 12,706