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Acquisition and Goodwill - Summary of Goodwill Activity (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Business Combination, Goodwill [Abstract]  
Beginning balance   
Goodwill acquired during the period 1,676us-gaap_GoodwillAcquiredDuringPeriod
Ending balance $ 1,676us-gaap_Goodwill