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Fair Values of Financial Instruments - Additional Information (Detail) | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Jan. 19, 2018 | Jun. 14, 2012 | Oct. 05, 2010
3.95% Senior Notes Due 2028 |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |
Debt interest rate | 3.95% |  | 3.95% |  |
Current market rates used in measuring fair value | 4.82% |  |  |  |
4.97% Series A Senior Notes, Due October 5th 2020 |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |
Debt interest rate |  |  |  |  | 4.97%
Current market rates used in measuring fair value | 4.56% | 4.46% |  |  |
4.27% Series B Senior Notes, Due June 14th 2022 |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |
Debt interest rate |  |  |  | 4.27% |
Current market rates used in measuring fair value | 4.65% | 4.64% |  |  |

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- Definition Minimum percentage of fair value transactions corroborated using observable market inputs required for level two. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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