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Schedule of Expected Future Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Mar. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
2014 $ 6,730  
2015 6,855  
2016 6,336  
2017 5,756  
2018 4,979  
Thereafter 14,571  
Net $ 45,227 $ 36,085