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Goodwill and Intangible Assets - Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, Gross $ 163,937 $ 124,887
Accumulated Amortization (114,308) (112,854)
Foreign Currency Translation 1,383 1,057
Intangible assets, net 51,012 13,090
Completed Technology [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, Gross 100,380 84,680
Accumulated Amortization (78,640) (78,072)
Foreign Currency Translation 662 519
Intangible assets, net 22,402 7,127
Customer Relationships [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, Gross 35,821 14,571
Accumulated Amortization (10,581) (9,831)
Foreign Currency Translation 631 454
Intangible assets, net 25,871 5,194
Patents, Trademarks, Trade Names and Other [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, Gross 27,736 25,636
Accumulated Amortization (25,087) (24,951)
Foreign Currency Translation 90 84
Intangible assets, net $ 2,739 $ 769