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Long-Term Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Mar. 31, 2016
Debt Instrument [Line Items]    
Total Debt $ 467,714 $ 507,714
Less: Current Portion of Long-term Debt (81,214) (8,000)
Less: Debt Origination Costs (6,366)  
Total Long-term Debt 380,134 499,714
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Total Debt   382,000
4.500% Senior Unsecured Notes Due 2026 [Member]    
Debt Instrument [Line Items]    
Total Debt 350,000  
Private Placement Senior Unsecured Notes [Member]    
Debt Instrument [Line Items]    
Total Debt $ 117,714 $ 125,714