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Reportable Segments and Geographic Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013 segment	Dec. 31, 2012	Dec. 31, 2011
Reportable Segments and Geographic Information
Number of business segments									4
Sales and other financial information by reportable segment
Revenue from external customers	$ 739,018	$ 775,584	$ 835,906	$ 809,896	$ 837,067	$ 716,684	$ 628,580	$ 611,915	$ 3,160,404	$ 2,794,246	$ 2,612,625
Gross margin									963,006	829,408	720,414
Total assets	4,227,157				4,254,847				4,227,157	4,254,847
Capital expenditures									391,725	428,731	272,150
Continuing Operations
Sales and other financial information by reportable segment
Total assets	4,205,797				4,204,500				4,205,797	4,204,500	4,176,571
Reportable Segments
Sales and other financial information by reportable segment
Capital expenditures									370,638	412,537	264,755
Reportable Segments | Continuing Operations
Sales and other financial information by reportable segment
Total assets	3,285,986				3,327,566				3,285,986	3,327,566	3,321,620
Other
Sales and other financial information by reportable segment
Capital expenditures									21,087	16,194	7,395
Other | Continuing Operations
Sales and other financial information by reportable segment
Total assets	919,811				876,934				919,811	876,934	854,951
North America Contract Operations
Sales and other financial information by reportable segment
Revenue from external customers									627,844	596,011	570,780
Gross margin									345,355	311,308	276,971
North America Contract Operations | Reportable Segments
Sales and other financial information by reportable segment
Capital expenditures									275,408	247,021	182,143
North America Contract Operations | Reportable Segments | Continuing Operations
Sales and other financial information by reportable segment
Total assets	1,907,097				1,841,755				1,907,097	1,841,755	1,958,306
International Contract Operations
Sales and other financial information by reportable segment
Revenue from external customers									476,016	463,957	445,059
Gross margin									279,072	279,349	260,654
International Contract Operations | Reportable Segments
Sales and other financial information by reportable segment
Capital expenditures									66,116	138,694	58,767
International Contract Operations | Reportable Segments | Continuing Operations
Sales and other financial information by reportable segment
Total assets	820,686				918,187				820,686	918,187	887,046
Aftermarket Services
Sales and other financial information by reportable segment
Revenue from external customers									395,600	385,861	371,327
Gross margin									86,182	82,271	59,567
Aftermarket Services | Reportable Segments
Sales and other financial information by reportable segment
Capital expenditures									2,082	3,304	1,768
Aftermarket Services | Reportable Segments | Continuing Operations
Sales and other financial information by reportable segment
Total assets	101,667				98,104				101,667	98,104	92,169
Fabrication
Sales and other financial information by reportable segment
Revenue from external customers									1,660,944	1,348,417	1,225,459
Gross margin									252,397	156,480	123,222
Fabrication | Reportable Segments
Sales and other financial information by reportable segment
Capital expenditures									27,032	23,518	22,077
Fabrication | Reportable Segments | Continuing Operations
Sales and other financial information by reportable segment
Total assets	$ 456,536				$ 469,520				$ 456,536	$ 469,520	$ 384,099

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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.

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Sum of the carrying amounts as of the balance sheet date of all assets 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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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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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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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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