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Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 segment	Mar. 31, 2013
Reportable Segments
Number of business segments	4
Revenue and other financial information by reportable segment
Revenue from external customers	$ 643,008	$ 809,896
Gross margin	233,486	224,742
North America Contract Operations
Revenue and other financial information by reportable segment
Revenue from external customers	156,523	157,950
Gross margin	85,442	86,840
International Contract Operations
Revenue and other financial information by reportable segment
Revenue from external customers	111,040	109,558
Gross margin	70,008	63,359
Aftermarket Services
Revenue and other financial information by reportable segment
Revenue from external customers	88,048	83,612
Gross margin	20,227	18,166
Fabrication
Revenue and other financial information by reportable segment
Revenue from external customers	287,397	458,776
Gross margin	$ 57,809	$ 56,377

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

No definition available.

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X

- 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.

+ References

No definition available.

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X

- 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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