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Employee Benefit Plans - Schedule of Amounts Not Yet Reflected in Net Periodic Benefit Cost and Included in Accumulated Other Comprehensive Income Loss or Regulatory Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Prior service cost (credit) |  | $ (524) |
Net loss |  | 23,467 |
Total |  | 22,943 |
Accumulated other comprehensive loss pre-tax |  | 7,986 |
Post-merger regulatory asset |  | 14,957 |
Subtotal |  | 22,943 |
Pre-merger regulatory asset |  | 557 |
Total unrecognized cost |  | 23,500 |
Chesapeake Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Prior service cost (credit) |  | 0 |
Net loss |  | 3,865 |
Total |  | 3,865 |
Accumulated other comprehensive loss pre-tax | [1] | 3,865 |
Post-merger regulatory asset |  | 0 |
Subtotal |  | 3,865 |
Pre-merger regulatory asset |  | 0 |
Total unrecognized cost |  | 3,865 |
FPU Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Prior service cost (credit) |  | 0 |
Net loss |  | 18,544 |
Total |  | 18,544 |
Accumulated other comprehensive loss pre-tax | [1] | 3,523 |
Post-merger regulatory asset |  | 15,021 |
Subtotal |  | 18,544 |
Pre-merger regulatory asset |  | 543 |
Total unrecognized cost |  | 19,087 |
Chesapeake SERP |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Prior service cost (credit) |  | 0 |
Net loss |  | 559 |
Total |  | 559 |
Accumulated other comprehensive loss pre-tax | [1] | 559 |
Post-merger regulatory asset |  | 0 |
Subtotal |  | 559 |
Pre-merger regulatory asset |  | 0 |
Total unrecognized cost |  | 559 |
Chesapeake Postretirement Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Prior service cost (credit) |  | (524) |
Net loss |  | 578 |
Total |  | 54 |
Accumulated other comprehensive loss pre-tax | [1] | 54 |
Post-merger regulatory asset |  | 0 |
Subtotal |  | 54 |
Pre-merger regulatory asset |  | 0 |
Total unrecognized cost |  | 54 |
FPU Medical Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Prior service cost (credit) |  | 0 |
Net loss |  | (79) |
Total |  | (79) |
Accumulated other comprehensive loss pre-tax | [1] | (15) |
Post-merger regulatory asset |  | (64) |
Subtotal |  | (79) |
Pre-merger regulatory asset |  | 14 | $ 22
Total unrecognized cost |  | $ (65) |
[1] | The total amount of accumulated other comprehensive loss recorded on our consolidated balance sheet as of December 31, 2018 is net of income tax benefits of $2.1 million.

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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