Fair Values of Financial Instruments - Additional Information (Detail)
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12 Months Ended | |
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Dec. 31, 2013
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Dec. 31, 2012
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4.97% Series A Senior Notes, Due October 5th 2020
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Current market rates used in measuring fair value | 4.52% | 3.36% |
4.27% Series B Senior Notes, Due June 14th 2022
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Current market rates used in measuring fair value | 4.89% | 3.70% |