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Goodwill by Segment Rollforward (Details) (USD $)
6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2013
Earn-out Arrangements [Member]
Jun. 30, 2012
Earn-out Arrangements [Member]
Jun. 30, 2013
Reportable Segment [Member]
Communications [Member]
Jun. 30, 2012
Reportable Segment [Member]
Communications [Member]
Dec. 31, 2011
Reportable Segment [Member]
Communications [Member]
Jun. 30, 2012
Reportable Segment [Member]
Communications [Member]
Earn-out Arrangements [Member]
Jun. 30, 2013
Reportable Segment [Member]
Electrical Transmission [Member]
Jun. 30, 2012
Reportable Segment [Member]
Electrical Transmission [Member]
Dec. 31, 2011
Reportable Segment [Member]
Electrical Transmission [Member]
Jun. 30, 2012
Reportable Segment [Member]
Electrical Transmission [Member]
Earn-out Arrangements [Member]
Jun. 30, 2013
Reportable Segment [Member]
Oil and Gas [Member]
Jun. 30, 2012
Reportable Segment [Member]
Oil and Gas [Member]
Dec. 31, 2011
Reportable Segment [Member]
Oil and Gas [Member]
Jun. 30, 2012
Reportable Segment [Member]
Oil and Gas [Member]
Earn-out Arrangements [Member]
Jun. 30, 2013
Reportable Segment [Member]
Power Generation and Industrial [Member]
Jun. 30, 2012
Reportable Segment [Member]
Power Generation and Industrial [Member]
Dec. 31, 2011
Reportable Segment [Member]
Power Generation and Industrial [Member]
Jun. 30, 2012
Reportable Segment [Member]
Power Generation and Industrial [Member]
Earn-out Arrangements [Member]
Goodwill [Roll Forward]                                          
Goodwill, beginning balance $ 826,110,000 $ 718,300,000 $ 714,800,000     $ 305,800,000 $ 258,000,000 $ 258,000,000   $ 129,500,000 $ 129,500,000 $ 129,500,000   $ 273,200,000 $ 213,200,000 $ 209,700,000   $ 117,600,000 $ 117,600,000 $ 117,600,000  
Accruals of acquisition-related contingent consideration       0 [1] 3,500,000 [1]       0 [1]       0 [1]       3,500,000 [1]       0 [1]
Additions from new business combinations, goodwill 36,800,000         5,400,000       0       31,400,000       0      
Currency translation adjustments, goodwill (2,700,000)         0       0       (2,700,000)       0      
Goodwill, ending balance $ 860,207,000 $ 718,300,000 $ 714,800,000     $ 311,200,000 $ 258,000,000 $ 258,000,000   $ 129,500,000 $ 129,500,000 $ 129,500,000   $ 301,900,000 $ 213,200,000 $ 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.