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Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 segment	Jun. 30, 2013
Reportable Segments
Number of business segments			4
Revenue and other financial information by reportable segment
Revenue from external customers	$ 739,270	$ 835,906	$ 1,382,278	$ 1,645,802
Gross margin	255,974	255,869	489,460	480,611
North America Contract Operations
Revenue and other financial information by reportable segment
Revenue from external customers	181,940	162,207	338,463	320,157
Gross margin	104,426	91,694	189,868	178,534
International Contract Operations
Revenue and other financial information by reportable segment
Revenue from external customers	134,392	117,872	245,432	227,430
Gross margin	87,890	67,857	157,898	131,216
Aftermarket Services
Revenue and other financial information by reportable segment
Revenue from external customers	100,359	99,368	188,407	182,980
Gross margin	21,062	21,432	41,289	39,598
Fabrication
Revenue and other financial information by reportable segment
Revenue from external customers	322,579	456,459	609,976	915,235
Gross margin	$ 42,596	$ 74,886	$ 100,405	$ 131,263

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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