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Estimated Future Amortization Expense By Year From Amortizable Intangibles (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Estimated future amortization expense    
2012 (remaining six months) $ 2,660  
2013 5,300  
2014 3,425  
2015 1,840  
2016 827  
Net $ 14,052 $ 7,060