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Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 segment	Sep. 30, 2012
Reportable Segments
Number of business segments			4
Sales and other financial information by reportable segment
Revenue from external customers	$ 776,003	$ 718,704	$ 2,424,724	$ 1,964,680
Gross margin	244,781	210,680	726,720	594,797
North America Contract Operations
Sales and other financial information by reportable segment
Revenue from external customers	153,046	151,532	476,122	450,684
Gross margin	81,600	76,315	261,462	230,808
International Contract Operations
Sales and other financial information by reportable segment
Revenue from external customers	117,545	110,632	344,975	336,046
Gross margin	66,947	64,372	198,163	198,805
Aftermarket Services
Sales and other financial information by reportable segment
Revenue from external customers	102,157	95,854	285,137	287,401
Gross margin	21,369	20,061	60,967	62,349
Fabrication
Sales and other financial information by reportable segment
Revenue from external customers	403,255	360,686	1,318,490	890,549
Gross margin	$ 74,865	$ 49,932	$ 206,128	$ 102,835

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.

+ References

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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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