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Goodwill and Intangible Assets - Total Estimated Annual Future Amortization Expense for the Acquired Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract]    
2013 $ 4,537  
2014 4,492  
2015 4,470  
2016 4,470  
2017 4,470  
Thereafter 23,338  
Total $ 45,777 $ 50,022