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Information by Segment and Geographic Area (Details 4) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Revenue from External Customer [Line Items] |  |  |
Consolidated Revenues | $ 3,046,018 | $ 3,302,740 | $ 3,038,678
General Corporate |  |  |
Revenue from External Customer [Line Items] |  |  |
Consolidated Revenues | 0 | 0 | 180
Outsourced, on-site services to steel mills and other metals producers and resource recovery technologies for the re-use of industrial waste stream by-products |  |  |
Revenue from External Customer [Line Items] |  |  |
Consolidated Revenues | 1,333,248 | 1,518,902 | 1,393,794
Engineered scaffolding, concrete forming and shoring, and other access-related services, rentals and sales |  |  |
Revenue from External Customer [Line Items] |  |  |
Consolidated Revenues | 937,293 | 1,108,293 | 1,031,807
Railway track maintenance services and equipment |  |  |
Revenue from External Customer [Line Items] |  |  |
Consolidated Revenues | 352,036 | 300,029 | 313,262
Air-cooled heat exchangers |  |  |
Revenue from External Customer [Line Items] |  |  |
Consolidated Revenues | 175,896 | 142,960 | 112,170
Industrial grating products |  |  |
Revenue from External Customer [Line Items] |  |  |
Consolidated Revenues | 136,157 | 113,388 | 76,975
Industrial abrasives and roofing granules |  |  |
Revenue from External Customer [Line Items] |  |  |
Consolidated Revenues | 70,855 | 69,399 | 67,737
Heat transfer products |  |  |
Revenue from External Customer [Line Items] |  |  |
Consolidated Revenues | $ 40,533 | $ 49,769 | $ 42,753

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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=6880815&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 + Details
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