Business Segment Information - Financial Data By Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Segment Reporting Information [Line Items]
Revenue	$ 446,176	$ 488,445	$ 608,344
Income from Operations	(150)	(3,859)	48,099
Depreciation and amortization	53,663	56,287	59,781
Oil And Gas [Member]
Segment Reporting Information [Line Items]
Revenue	360,275	411,438	541,455
Income from Operations	19,862	13,717	74,850
Depreciation and amortization	51,768	54,542	57,923
ROVs [Member]
Segment Reporting Information [Line Items]
Revenue	94,022	108,352	147,621
Income from Operations	5,925	4,031	26,987
Depreciation and amortization	29,229	29,552	33,684
Subsea Products Member
Segment Reporting Information [Line Items]
Revenue	150,639	149,052	194,812
Income from Operations	11,483	4,068	40,640
Depreciation and amortization	12,999	13,795	12,807
Subsea Projects [Member]
Segment Reporting Information [Line Items]
Revenue	62,956	94,096	129,422
Income from Operations	187	2,421	6,789
Depreciation and amortization	8,080	8,595	8,519
Asset Integrity [Member]
Segment Reporting Information [Line Items]
Revenue	52,658	59,938	69,600
Income from Operations	2,267	3,197	434
Depreciation and amortization	1,460	2,600	2,913
Advanced Technologies [Member]
Segment Reporting Information [Line Items]
Revenue	85,901	77,007	66,889
Income from Operations	5,026	1,331	593
Depreciation and amortization	797	791	734
Unallocated Expenses [Member]
Segment Reporting Information [Line Items]
Income from Operations	(25,038)	(18,907)	(27,344)
Depreciation and amortization	$ 1,098	$ 954	$ 1,124

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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