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Stock plans - Schedule of Activity Related to Restricted Stock (Detail) (Restricted Stock [Member])
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested, January 1 15,425 4,883 2,936
Granted shares 1,820 10,542 1,947
Vested shares         
Forfeited shares         
Nonvested, December 31 17,245 15,425 4,883