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Goodwill and Intangible Assets - Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, Gross $ 124,887 $ 124,887
Accumulated Amortization (113,264) (112,854)
Foreign Currency Translation 896 1,057
Intangible assets, net 12,519 13,090
Completed Technology [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, Gross 84,680 84,680
Accumulated Amortization (78,277) (78,072)
Foreign Currency Translation 445 519
Intangible assets, net 6,848 7,127
Customer Relationships [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, Gross 14,571 14,571
Accumulated Amortization (9,983) (9,831)
Foreign Currency Translation 372 454
Intangible assets, net 4,960 5,194
Patents, Trademarks, Trade Names and Other [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, Gross 25,636 25,636
Accumulated Amortization (25,004) (24,951)
Foreign Currency Translation 79 84
Intangible assets, net $ 711 $ 769