Annual report pursuant to Section 13 and 15(d)

Estimated Aggregate Future Amortization Expense for Intangible Assets (Detail)

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Estimated Aggregate Future Amortization Expense for Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Goodwill [Line Items]      
For the year ended December 31, 2013 $ 4,199    
For the year ended December 31, 2014 3,644    
For the year ended December 31, 2015 3,351    
For the year ended December 31, 2016 3,128    
For the year ended December 31, 2017 2,498    
Thereafter 3,747    
Intangible assets with Finite lives, Ending balance $ 20,567 $ 27,068 $ 18,134