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Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Mar. 31, 2012
Debt Instrument [Line Items]    
Total $ 489,259 $ 266,936
Less: Current Portion of Long-term Debt   (4,677)
Long-term Debt 489,259 262,259
Bank Credit Facility [Member]
   
Debt Instrument [Line Items]    
Total 297,000 70,000
Senior Notes [Member]
   
Debt Instrument [Line Items]    
Total $ 192,259 $ 196,936