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Estimated Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]    
2012 $ 293 [1]  
2013 1,027  
2014 1,014  
2015 840  
2016 609  
2017 and thereafter 620  
Net Amount $ 4,403 $ 5,205
[1] Represents estimated amortization expense for the three months ending December 31, 2012.