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Long-Term Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Mar. 31, 2017
Debt Instrument [Line Items]    
Credit Facility $ 195,000 $ 225,000
Total Debt 662,714 692,714
Less: Current Portion of Long-term Debt (81,214) (81,214)
Less: Debt Origination Costs (5,912) (6,247)
Total Long-term Debt 575,588 605,253
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 $ 117,714 $ 117,714