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Estimated Future Amortization Expense for Acquired Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Jun. 30, 2012
Expected Amortization Expense [Line Items]    
2013 $ 4,699  
2014 7,797  
2015 7,503  
2016 7,018  
2017 5,537  
Thereafter 7,011  
Net Carrying Amount $ 39,565 $ 25,083