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Reportable Segments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) segment	Jun. 30, 2014 USD ($)
Reportable segments
Number of reportable segments | segment			4
Revenue and other financial information by reportable segment
Revenue from external customers	$ 683,832	$ 739,270	$ 1,412,914	$ 1,382,278
Gross margin	246,841	255,974	515,853	489,460
North America contract operations
Revenue and other financial information by reportable segment
Revenue from external customers	198,259	181,940	400,520	338,463
Gross margin	117,038	104,426	236,620	189,868
International contract operations
Revenue and other financial information by reportable segment
Revenue from external customers	115,250	134,392	235,941	245,432
Gross margin	70,505	87,890	146,857	157,898
Aftermarket services
Revenue and other financial information by reportable segment
Revenue from external customers	90,834	100,359	177,690	188,407
Gross margin	20,663	21,062	41,585	41,289
Fabrication
Revenue and other financial information by reportable segment
Revenue from external customers	279,489	322,579	598,763	609,976
Gross margin	$ 38,635	$ 42,596	$ 90,791	$ 100,405

X

- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity, excluding depreciation and amortization expense. Gross margin is a non-GAAP financial measure.

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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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



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 03



-Paragraph 1



-Article 5

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