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Stock-based Compensation Plans - Additional Information 4 (Detail) - USD ($) shares in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Deferred compensation plan vesting period |  |  | 3 years |  |
Deferred compensation plan | $ 8,871,000 | $ (223,000) | $ 16,432,000 | $ 559,000 |
Shares held in rabbi trust total | 3.2 |  | 3.2 |  | 2.6
Vested shares held in rabbi trust | 2.5 |  | 2.5 |  | 2.4
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 | $ 92,000 | $ 92,000 | $ 275,000 | $ 275,000 |

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