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Goodwill and Other Intangible Assets - Schedule of Estimated Amortization Expense for Future Years (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Goodwill And Intangible Assets Disclosure [Abstract]      
2013 remaining $ 1,919    
2014 6,638    
2015 5,399    
2016 4,352    
2017 2,982    
Thereafter 5,306    
Net Carrying Amount $ 26,596 $ 29,220 $ 31,273