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Stock-based Compensation Plans - Additional Information 4 (Detail) - USD ($) shares in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Deferred compensation plan vesting period |  |  | 3 years |  |
Deferred compensation plan | $ 34,278,000 | $ 6,237,000 | $ 89,551,000 | $ 10,287,000 |
Shares held in rabbi trust total | 6.4 |  | 6.4 |  | 6.1
Vested shares held in rabbi trust | 5.3 |  | 5.3 |  | 5.0
Post-Retirement Medical Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Estimated prior service cost amortized from accumulated other comprehensive income into general and administrative expense | $ 90,000 | $ 90,000 | $ 275,000 | $ 275,000 |

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