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Goodwill and Intangible Assets - Summary of Change in the Carrying Amount of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]    
Balance, beginning of year $ 10,946 $ 10,821
Acquired during the year 16,248 125
Balance, end of year $ 27,194 $ 10,946