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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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Finite And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets subject to amortization         $ 426,732
Indefinite-lived Intangible Assets 4,500   4,500   4,500
Intangible assets, gross         431,232
Accumulated Amortization (248,197)   (248,197)   (223,355)
Amortization Expense (9,538) (7,026) (26,398) (17,406)  
Additions     51,198    
Foreign Currency Translation Adjustments     (3,217)    
Intangible Assets Subject to Amortization, Net 224,960   224,960    
Intangible assets, net 229,460   229,460   207,877
Remaining Weighted Average Amortization Period in Years     11 years 8 months 12 days    
Customer Relationships [Member]
          
Finite And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets subject to amortization         199,224
Accumulated Amortization         (59,417)
Amortization Expense     (11,439)    
Additions     34,106    
Foreign Currency Translation Adjustments     (2,605)    
Intangible Assets Subject to Amortization, Net 159,869   159,869    
Remaining Weighted Average Amortization Period in Years     10 years 7 months 6 days    
Backlog [Member]
          
Finite And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets subject to amortization         136,831
Accumulated Amortization         (127,233)
Amortization Expense     (9,877)    
Additions     7,512    
Foreign Currency Translation Adjustments     (74)    
Intangible Assets Subject to Amortization, Net 7,159   7,159    
Remaining Weighted Average Amortization Period in Years     1 year 4 months 24 days    
Trade Names [Member]
          
Finite And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets subject to amortization         40,342
Accumulated Amortization         (4,228)
Amortization Expense     (1,521)    
Additions     6,413    
Foreign Currency Translation Adjustments     (389)    
Intangible Assets Subject to Amortization, Net 40,617   40,617    
Remaining Weighted Average Amortization Period in Years     21 years 1 month 6 days    
Non-compete Agreements [Member]
          
Finite And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets subject to amortization         28,895
Accumulated Amortization         (22,861)
Amortization Expense     (2,000)    
Additions     2,763    
Foreign Currency Translation Adjustments     (140)    
Intangible Assets Subject to Amortization, Net 6,657   6,657    
Remaining Weighted Average Amortization Period in Years     3 years 6 months    
Patented Rights and Developed Technology [Member]
          
Finite And Indefinite Lived Intangible Assets [Line Items]          
Intangible assets subject to amortization         21,440
Accumulated Amortization         (9,616)
Amortization Expense     (1,561)    
Additions     404    
Foreign Currency Translation Adjustments     (9)    
Intangible Assets Subject to Amortization, Net $ 10,658   $ 10,658    
Remaining Weighted Average Amortization Period in Years     4 years 8 months 12 days