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Stock-based Compensation Plans - Additional Information 4 (Detail) - USD ($) shares in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Deferred compensation plan vesting period |  |  | 3 years |  |
Deferred compensation plan | $ (6,615,000) | $ 14,466,000 | $ 782,000 | $ 27,635,000 |
Shares held in rabbi trust total | 3.1 |  | 3.1 |  | 2.9
Vested shares held in rabbi trust | 2.9 |  | 2.9 |  | 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 |  |  | $ 185,000 |  |

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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