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Goodwill And Other Intangible Assets (Other Intangible Assets) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Finite And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets         $ 367,125
Accumulated Amortization (194,607)   (194,607)   (164,401)
Amortization Expense (10,504) (8,295) (29,447) (21,432)  
Additions     19,472    
Foreign Currency Adjustments     1,836    
Intangible Assets, Net, subject to amortization 194,585   194,585    
Remaining Weighted Average Amortization Period in Years     12 years 8 months 12 days    
Indefinite-lived Intangible Assets, Beginning Balance     4,500    
Indefinite-lived Intangible Assets, Ending Balance 4,500   4,500    
Intangible assets, gross         371,625
Intangible assets, net 199,085   199,085   207,224
Customer Relationships [Member]
          
Finite And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets         171,893
Accumulated Amortization         (38,158)
Amortization Expense     (8,731)    
Additions     5,311    
Foreign Currency Adjustments     1,102    
Intangible Assets, Net, subject to amortization 131,417   131,417    
Remaining Weighted Average Amortization Period in Years     11 years 4 months 24 days    
Backlog [Member]
          
Finite And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets         121,779
Accumulated Amortization         (101,153)
Amortization Expense     (14,560)    
Additions     4,906    
Foreign Currency Adjustments     415    
Intangible Assets, Net, subject to amortization 11,387   11,387    
Remaining Weighted Average Amortization Period in Years     1 year 6 months    
Trade Names [Member]
          
Finite And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets         29,661
Accumulated Amortization         (1,948)
Amortization Expense     (793)    
Additions     2,768    
Foreign Currency Adjustments     195    
Intangible Assets, Net, subject to amortization 29,883   29,883    
Remaining Weighted Average Amortization Period in Years     27 years 6 months    
Non-compete Agreements [Member]
          
Finite And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets         27,414
Accumulated Amortization         (17,604)
Amortization Expense     (3,914)    
Additions     1,926    
Foreign Currency Adjustments     140    
Intangible Assets, Net, subject to amortization 7,962   7,962    
Remaining Weighted Average Amortization Period in Years     3 years 2 months 12 days    
Patented Rights And Developed Technology [Member]
          
Finite And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets         16,378
Accumulated Amortization         (5,538)
Amortization Expense     (1,449)    
Additions     4,561    
Foreign Currency Adjustments     (16)    
Intangible Assets, Net, subject to amortization $ 13,936   $ 13,936    
Remaining Weighted Average Amortization Period in Years     7 years