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Employee Benefit Plans - Amounts in Accumulated Other Comprehensive Income/Loss and Regulatory Asset (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Chesapeake Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amortization of pre-merger regulatory asset | $ 0 | $ 0 | $ 0
FPU Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amortization of pre-merger regulatory asset | 761 | 761 | 761
FPU Medical Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amortization of pre-merger regulatory asset | $ 8 | $ 8 | $ 8

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- Definition Amortization of pre-merger regulatory asset. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |