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Business segments (Income Statement by Segment) (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) segment	Mar. 31, 2015 USD ($)	Dec. 31, 2015 segment
Segment Reporting [Abstract]
Number of operating segments | segment	3		2
Segment Reporting Information [Line Items]
Net revenues	$ 159,441	$ 348,096
Operating income	(25,013)	40,232
Transaction expenses	166	217
Loss (gain) on sale of assets and other	(32)	(312)
Operating Segments
Segment Reporting Information [Line Items]
Operating income	(24,879)	40,137
Operating Segments | Drilling & Subsea
Segment Reporting Information [Line Items]
Net revenues	65,295	163,553
Operating income	(9,823)	19,839
Operating Segments | Production & Infrastructure
Segment Reporting Information [Line Items]
Net revenues	60,511	90,523
Operating income	(1,371)	7,990
Operating Segments | Completions
Segment Reporting Information [Line Items]
Net revenues	34,304	94,496
Operating income	(6,458)	20,569
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net revenues	(669)	(476)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Operating income	$ (7,227)	$ (8,261)

X

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460

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- Definition

Amount of gain (loss) on sale or disposal of assets utilized in financial service operations.

+ References

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ 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=26872669&loc=d3e20235-122688

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- 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.

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