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Summary of Debt Outstanding (Parenthetical) (Detail) - USD ($) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2015 | May. 31, 2015 | Dec. 31, 2015 | Mar. 31, 2015
Senior Notes due in April 2027 | Subsidiary of the company |  |  |  |
Debt [Line Items] |  |  |  |
Debt instruments face amount |  | $ 31.3 |  |
Debt instrument maturity, month and year |  | 2027-04 |  |
Semi-annual principal payments |  | $ 1.3 |  |
Debt instrument bearing floating interest rate |  | 2.92% |  |
Indebtedness rate |  | 1.30% |  |
Total capitalization rate |  | 4.22% |  |
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 December 31, 2016 |  |  | $ 42.5 |
July 2003 Senior Unsecured Notes |  |  |  |
Debt [Line Items] |  |  |  |
Repayments of debt | $ 35.0 |  |  |

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