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Stock-based Compensation Plans - Additional Information 4 (Detail) - USD ($) shares in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of employees contribution |  |  |  |  |  |  |  |  | 75.00% |  |
Maximum percentage of employers contribution in cash |  |  |  |  |  |  |  |  | 6.00% |  |
Employer contribution |  |  |  |  |  |  |  |  | $ 5,100,000 | $ 4,700,000 | $ 6,100,000
Deferred compensation plan vesting period |  |  |  |  |  |  |  |  | 3 years |  |
Deferred compensation plan | $ 14,077,000 | $ 9,203,000 | $ 14,466,000 | $ 13,169,000 | $ 11,013,000 | $ 11,636,000 | $ (25,746,000) | $ (16,056,000) | $ 50,915,000 | $ (19,153,000) | $ 77,627,000
Shares held in rabbi trust total | 2.9 |  |  |  | 2.7 |  |  |  | 2.9 | 2.7 |
Vested shares held in rabbi trust | 2.8 |  |  |  | 2.3 |  |  |  | 2.8 | 2.3 |
Post-Retirement Medical Plan |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expected future benefit payments for the five year period 2018 through 2022 | $ 675,000 |  |  |  |  |  |  |  | $ 675,000 |  |
Expected future benefit payments for the five year period 2023 through 2027 | 638,000 |  |  |  |  |  |  |  | 638,000 |  |
Estimated prior service cost amortized from accumulated other comprehensive income into statement of operation in 2018 | $ 369,000 |  |  |  |  |  |  |  | $ 369,000 |  |

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