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Business Segment Information - Total Assets By Reportable Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total assets	$ 2,246,941	$ 2,399,959
Reportable Segments [Member] | Well Intervention [Member]
Segment Reporting Information [Line Items]
Total assets	1,596,517	1,484,109
Reportable Segments [Member] | Robotics [Member]
Segment Reporting Information [Line Items]
Total assets	186,901	274,926
Reportable Segments [Member] | Production Facilities [Member]
Segment Reporting Information [Line Items]
Total assets	158,192	182,007
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total assets	$ 305,331	$ 458,917

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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