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Stock-based Compensation Plans - Additional Information 4 (Detail) - USD ($) shares in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Deferred compensation plan vesting period |  |  | 3 years |  |
Deferred compensation plan | $ (223,000) | $ 9,203,000 | $ 559,000 | $ 36,838,000 |
Shares held in rabbi trust total | 2.9 |  | 2.9 |  | 2.9
Vested shares held in rabbi trust | 2.7 |  | 2.7 |  | 2.8
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 |  |  | $ 276,000 |  |

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