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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

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- 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. + Details
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