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Fair Values of Financial Instruments - Additional Information (Detail) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Series A, Senior Notes, 4.97 Percent, Due October 5th 2020 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Current market rates used in measuring fair value | 4.26% | 3.36%
Series B, Senior Notes, 4.27 Percent, Due June 14th 2022 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Current market rates used in measuring fair value | 4.61% | 3.70%

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