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Fair Values of Financial Instruments - Additional Information (Detail) | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Nov. 15, 2019 | Jan. 19, 2018
3.95% Senior Notes Due 2028 |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Debt interest rate | 3.95% | 3.95% |  | 3.95%
Current market rates used in measuring fair value | 3.81% | 5.24% |  |
5.15% Senior Notes Due 2029 |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Debt interest rate | 5.15% | 5.15% | 5.15% |
Current market rates used in measuring fair value | 4.67% | 6.42% |  |

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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=120391452&loc=d3e13212-122682 + Details
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