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Employee Benefit Plans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Amortization of prior service cost |  | $ (19) | $ (19) | $ (57) | $ (58)
Defined Benefit Plan Actuarial Gain Loss, Net Settlement |  |  | 128 |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  | 217 | 257 | 651 | 683
Defined Benefit Plan, Benefit Obligation, Payment for Settlement |  |  | (58) |  | (58)
Defined Benefit Plan Amounts Recognized Gain (Loss) |  | 198 | 238 | 594 | 625
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | [1] | 89 | 24 | 267 | 312
Defined Benefit Plan Amounts Recognized From Regulatory Asset |  | 109 | 104 | 327 | 313
Chesapeake Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  | 100 |  | 300 |
Interest cost |  | 46 | 104 | 138 | 314
Expected return on plan assets |  | (42) | (127) | (126) | (381)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  | 65 | 101 | 195 | 304
Net periodic cost (benefit) | [1] | 69 | 78 | 207 | 237
Total periodic cost |  | 69 | 78 | 207 | 237
Defined Benefit Plan Amounts Recognized Gain (Loss) |  | 65 | 101 | 195 | 304
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | [1] | 65 | 101 | 195 | 304
Florida Public Utilities Company Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  | 500 |  | 2,600 |
Interest cost |  | 518 | 614 | 1,554 | 1,844
Expected return on plan assets |  | (745) | (693) | (2,235) | (2,079)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  | 135 | 128 | 405 | 386
Net periodic cost (benefit) | [1] | (92) | 49 | (276) | 151
Amortization of pre-merger regulatory asset |  | 0 | 162 | 0 | 543
Total periodic cost |  | (92) | 211 | (276) | 694
Defined Benefit Plan Amounts Recognized Gain (Loss) |  | 135 | 128 | 405 | 386
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | [1] | 26 | 24 | 78 | 73
Defined Benefit Plan Amounts Recognized From Regulatory Asset |  | 109 | 104 | 327 | 313
Chesapeake Pension SERP [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Interest cost |  | 16 | 16 | 48 | 58
Defined Benefit Plan Actuarial Gain Loss, Net Settlement |  |  | (93) |  | (68)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  | 5 | 17 | 15 | (42)
Net periodic cost (benefit) | [1] | 21 | 33 | 63 | 126
Total periodic cost |  | 21 | 91 | 63 | 184
Defined Benefit Plan Amounts Recognized Gain (Loss) |  | 5 | 17 | 15 | (42)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | [1] | 5 | (93) | 15 | (42)
Chesapeake Postretirement Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Interest cost |  | 8 | 10 | 24 | 29
Amortization of prior service cost |  | (19) | (19) | (57) | (58)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  | 12 | 11 | 36 | 35
Net periodic cost (benefit) | [1] | 1 | 2 | 3 | 6
Total periodic cost |  | 1 | 2 | 3 | 6
Defined Benefit Plan Amounts Recognized Gain (Loss) |  | (7) | (8) | (21) | (23)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | [1] | (7) | (8) | (21) | (23)
Florida Public Utilities Company Medical Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Interest cost |  | 10 | 12 | 30 | 36
Net periodic cost (benefit) | [1] | 10 | 12 | 30 | 36
Amortization of pre-merger regulatory asset |  | 2 | 2 | 6 | 6
Total periodic cost |  | $ 12 | $ 14 | $ 36 | $ 42
[1] | See Note 9, Stockholders' Equity.

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