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Estimated Amortization Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]    
2013 $ 2,811  
2014 2,538  
2015 2,412  
2016 2,385  
2017 1,947  
Thereafter 4,741  
Net carrying amount $ 16,834 $ 1,251