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Stock-based Compensation Plans - Summary of Change in Post Retirement Benefit Obligation (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Other Changes in Benefit Obligations in Other Comprehensive Income (Loss): |  |  |
Net loss (gain) | $ 532 | $ (526) | $ 0
Prior service cost | 0 | 0 | 1,769
Amortization of prior service cost | (369) | (369) | 0
Other Post Retirement Benefits |  |  |
Change in Benefit Obligation: |  |  |
Benefit obligation at beginning of year | 1,355 | 1,769 |
Prior service cost | 0 | 0 |
Service cost | 88 | 94 |
Interest cost | 68 | 58 |
Actuarial loss (gain) | 532 | (526) |
Benefits paid | (86) | (40) |
Benefit obligation at end of year | 1,957 | 1,355 | $ 1,769
Amounts recognized in the consolidated balance sheet: |  |  |
Long-term liabilities | 1,957 | 1,355 |
Components of Net Periodic Post Retirement Benefit Cost: |  |  |
Service cost | 88 | 94 |
Interest cost | 68 | 58 |
Amortization of prior service cost | 369 | 369 |
Net periodic post retirement costs (recognized in general and administrative expense) | 525 | 521 |
Other Changes in Benefit Obligations in Other Comprehensive Income (Loss): |  |  |
Net loss (gain) | 532 | (526) |
Prior service cost | 0 | 0 |
Amortization of prior service cost | (369) | (369) |
Total recognized in other comprehensive income (loss) | 163 | (895) |
Total recognized in net periodic benefit cost and other comprehensive income (loss) | $ 688 | $ (374) |

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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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