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Goodwill and Other Intangible Assets - Future Amortization Expense Related to Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
May 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]  
2013 $ 13,541
2014 12,682
2015 12,682
2016 12,682
2017 $ 12,682