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Pension Plan - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Compensation And Retirement Disclosure [Abstract] |  |  |
Amount of contributions to contributory plan | $ 56,600,000 | $ 50,100,000 | $ 45,700,000
Accumulated benefit obligation | 108,300,000 | 115,900,000 |
Fair value of plan assets exceeded accumulated benefit obligation |  | $ 2,700,000 |
Fair value of plan accumulated benefit obligation exceeds plan assets | 3,700,000 |  |
Estimated net loss that will be amortized from accumulated other comprehensive income over the next fiscal year | 0 |  |
Estimated prior service cost that will be amortized from accumulated other comprehensive income over the next fiscal year | $ 0 |  |

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- Definition Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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