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Fair Values of Financial Instruments - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
4.97% Series A Senior Notes, Due October 5th 2020 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Current market rates used in measuring fair value | 6.10% | 6.66%
4.27% Series B Senior Notes, Due June 14th 2022 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Current market rates used in measuring fair value | 6.37% | 6.95%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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