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Long-Term Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Mar. 31, 2017
Debt Instrument [Line Items]    
Credit Facility $ 185,000 $ 225,000
Total Debt 571,500 692,714
Less: Current Portion of Long-term Debt   (81,214)
Less: Debt Origination Costs (5,745) (6,247)
Total Long-term Debt 565,755 605,253
4.500% Senior Unsecured Notes Due 2026 [Member]    
Debt Instrument [Line Items]    
Total Debt 350,000 350,000
Private Placement Senior Unsecured Notes [Member]    
Debt Instrument [Line Items]    
Total Debt $ 36,500 $ 117,714