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Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 segment	Sep. 30, 2013
Reportable Segments
Number of business segments			4
Revenue and other financial information by reportable segment
Revenue from external customers	$ 723,832	$ 775,584	$ 2,106,110	$ 2,421,386
Gross margin	266,485	244,931	755,945	725,542
North America Contract Operations
Revenue and other financial information by reportable segment
Revenue from external customers	191,000	152,627	529,463	472,784
Gross margin	108,547	81,750	298,415	260,284
International Contract Operations
Revenue and other financial information by reportable segment
Revenue from external customers	124,355	117,545	369,787	344,975
Gross margin	76,372	66,947	234,270	198,163
Aftermarket Services
Revenue and other financial information by reportable segment
Revenue from external customers	96,005	102,157	284,412	285,137
Gross margin	20,495	21,369	61,784	60,967
Fabrication
Revenue and other financial information by reportable segment
Revenue from external customers	312,472	403,255	922,448	1,318,490
Gross margin	$ 61,071	$ 74,865	$ 161,476	$ 206,128

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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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

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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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