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Changes in Carrying Amount of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Goodwill [Line Items]    
Beginning Balance $ 58,214 $ 38,854
Acquisition 14,098 19,360
Adjustments related to purchase accounting (5,152)  
Ending Balance $ 67,160 $ 58,214