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Long-Term Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Mar. 31, 2016
Debt Instrument [Line Items]    
Credit Facility $ 498,714 $ 507,714
Total Debt 498,714 507,714
Less: Current Portion of Long-term Debt (8,000) (8,000)
Total Debt 490,714 499,714
Revolving Credit Facility    
Debt Instrument [Line Items]    
Credit Facility 373,000 382,000
Total Debt 373,000 382,000
Senior Notes    
Debt Instrument [Line Items]    
Credit Facility 125,714 125,714
Total Debt $ 125,714 $ 125,714