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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

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