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Employee Benefits - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items] |  |
Service costs included in net periodic pension expense | $ 0 |
Expected long-term rate of return on plan assets | 3.50% | 4.80%
Fixed Income Funds | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percentage) | 85.00% |
Fixed Income Funds | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percentage) | 95.00% |
Equity Securities | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percentage) | 5.00% |
Equity Securities | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target allocation (as a percentage) | 15.00% |

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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit 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 (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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