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Goodwill by Segment Rollforward (Details) (USD $) | 3 Months Ended |  |  | 3 Months Ended |  |  | 3 Months Ended |  |  | 3 Months Ended |  |  | 3 Months Ended |  |  | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2013 Earn-out Arrangements [Member] | Mar. 31, 2012 Earn-out Arrangements [Member] | Mar. 31, 2013 Reportable Segment [Member] Communications [Member] | Mar. 31, 2012 Reportable Segment [Member] Communications [Member] | Dec. 31, 2011 Reportable Segment [Member] Communications [Member] | Mar. 31, 2013 Reportable Segment [Member] Communications [Member] Earn-out Arrangements [Member] | Mar. 31, 2012 Reportable Segment [Member] Communications [Member] Earn-out Arrangements [Member] | Mar. 31, 2013 Reportable Segment [Member] Electrical Transmission [Member] | Mar. 31, 2012 Reportable Segment [Member] Electrical Transmission [Member] | Dec. 31, 2011 Reportable Segment [Member] Electrical Transmission [Member] | Mar. 31, 2013 Reportable Segment [Member] Electrical Transmission [Member] Earn-out Arrangements [Member] | Mar. 31, 2012 Reportable Segment [Member] Electrical Transmission [Member] Earn-out Arrangements [Member] | Mar. 31, 2013 Reportable Segment [Member] Oil and Gas [Member] | Mar. 31, 2012 Reportable Segment [Member] Oil and Gas [Member] | Dec. 31, 2011 Reportable Segment [Member] Oil and Gas [Member] | Mar. 31, 2013 Reportable Segment [Member] Oil and Gas [Member] Earn-out Arrangements [Member] | Mar. 31, 2012 Reportable Segment [Member] Oil and Gas [Member] Earn-out Arrangements [Member] | Mar. 31, 2013 Reportable Segment [Member] Power Generation and Industrial [Member] | Mar. 31, 2012 Reportable Segment [Member] Power Generation and Industrial [Member] | Dec. 31, 2011 Reportable Segment [Member] Power Generation and Industrial [Member] | Mar. 31, 2013 Reportable Segment [Member] Power Generation and Industrial [Member] Earn-out Arrangements [Member] | Mar. 31, 2012 Reportable Segment [Member] Power Generation and Industrial [Member] Earn-out Arrangements [Member]
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, beginning balance | $ 824,707,000 | $ 714,800,000 | $ 714,800,000 |  |  |  |  | $ 306,800,000 | $ 258,000,000 | $ 258,000,000 |  |  |  |  | $ 129,500,000 | $ 129,500,000 | $ 129,500,000 |  |  |  |  | $ 270,800,000 | $ 209,700,000 | $ 209,700,000 |  |  |  |  | $ 117,600,000 | $ 117,600,000 | $ 117,600,000 |  |  |  |
Accruals of acquisition-related contingent consideration |  |  |  | 0 | [1] | 0 | [1] |  |  |  | 0 | [1] | 0 | [1] |  |  |  | 0 | [1] | 0 | [1] |  |  |  | 0 | [1] | 0 | [1] |  |  |  | 0 | [1] | 0 | [1]
Currency translation adjustments, goodwill | (700,000) |  |  |  |  |  |  | 0 |  |  |  |  |  |  | 0 |  |  |  |  |  |  | (700,000) |  |  |  |  |  |  | 0 |  |  |  |  |  |
Goodwill, ending balance | $ 824,014,000 | $ 714,800,000 | $ 714,800,000 |  |  |  |  | $ 306,800,000 | $ 258,000,000 | $ 258,000,000 |  |  |  |  | $ 129,500,000 | $ 129,500,000 | $ 129,500,000 |  |  |  |  | $ 270,100,000 | $ 209,700,000 | $ 209,700,000 |  |  |  |  | $ 117,600,000 | $ 117,600,000 | $ 117,600,000 |  |  |  |
[1] | Represents contingent consideration for acquisitions prior to January 1, 2009, which is only accrued as earned, in accordance with U.S. GAAP.

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- Definition Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -Clause 1 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph l -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. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 34 -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. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 43 -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. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -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. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 72 -Subparagraph d -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. + Details
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- Definition Amount of other decrease (increase) in the carrying value of goodwill that is not separately disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Details
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- Definition The increase (decrease) to the recorded value of goodwill for foreign currency translation adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph e -Clause 6 -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. + Details
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