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Reportable Segments and Geographic Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012 segment	Dec. 31, 2011	Dec. 31, 2010
Reportable Segments and Geographic Information
Number of business segments									4
Sales and other financial information by reportable segment
Revenue from external customers	$ 838,922	$ 718,704	$ 630,735	$ 615,241	$ 689,063	$ 689,820	$ 644,068	$ 606,928	$ 2,803,602	$ 2,629,879	$ 2,417,183
Gross margin									834,223	728,427	797,088
Total assets excluding discontinued operations	4,233,101				4,242,778				4,233,101	4,242,778	4,611,742
Capital expenditures									428,731	272,185	231,607
North America contract operations
Sales and other financial information by reportable segment
Revenue from external customers									605,367	588,034	592,055
Gross margin									316,123	284,984	300,431
Total assets excluding discontinued operations	1,846,447				1,982,513				1,846,447	1,982,513	1,981,757
Capital expenditures									247,021	182,178	106,720
International contract operations
Sales and other financial information by reportable segment
Revenue from external customers									463,957	445,059	465,144
Gross margin									279,349	260,654	289,787
Total assets excluding discontinued operations	918,187				887,046				918,187	887,046	976,700
Capital expenditures									138,694	58,767	106,530
Aftermarket services
Sales and other financial information by reportable segment
Revenue from external customers									385,861	371,327	293,757
Gross margin									82,271	59,567	45,365
Total assets excluding discontinued operations	98,104				92,169				98,104	92,169	144,554
Capital expenditures									3,304	1,768	1,332
Fabrication
Sales and other financial information by reportable segment
Revenue from external customers									1,348,417	1,225,459	1,066,227
Gross margin									156,480	123,222	161,505
Total assets excluding discontinued operations	469,520				384,099				469,520	384,099	580,255
Capital expenditures									23,518	22,077	12,187
Reportable Segments Total
Sales and other financial information by reportable segment
Revenue from external customers									2,803,602	2,629,879	2,417,183
Gross margin									834,223	728,427	797,088
Total assets excluding discontinued operations	3,332,258				3,345,827				3,332,258	3,345,827	3,683,266
Capital expenditures									412,537	264,790	226,769
Other
Sales and other financial information by reportable segment
Total assets excluding discontinued operations	900,843				896,951				900,843	896,951	928,476
Capital expenditures									$ 16,914	$ 7,395	$ 4,838

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets, excluding assets associated with discontinued operations, that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 15

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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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.

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