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Goodwill and Intangible Assets (Estimated Future Amortization of Acquired Intangible Assets) (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract]    
2012 $ 2,278  
2013 8,984  
2014 7,135  
2015 6,133  
2016 5,143  
Thereafter 13,054  
Net Carrying Amount $ 42,727 $ 53,114