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Summary of Debt Outstanding (Parenthetical) (Detail) - USD ($) $ in Millions | Jun. 30, 2015 | Mar. 31, 2015
--- | --- | ---
Revolving Credit Agreement |  |
Debt [Line Items] |  |
Revolving credit facility, remaining borrowing capacity | $ 600.0 | $ 580.0
September 2010 Senior Unsecured Notes |  |
Debt [Line Items] |  |
Principal repayments due during the twelve months ending June 30, 2016 | $ 42.5 |

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