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Employee Benefit Plans - Amounts Included in Regulatory Asset and Accumulated Other Comprehensive Income/Loss Recognized as Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Prior service cost (credit) |  | $ (20) | $ (17)
Net loss |  | 272 | 248
Recognized from accumulated other comprehensive loss | [1] | 148 | 137
Recognized from regulatory asset |  | 104 | 94
Total recognized in net periodic benefit cost |  | 252 | 231
Chesapeake Pension Plan [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Prior service cost (credit) |  | 0 | 0
Net loss |  | 104 | 90
Recognized from accumulated other comprehensive loss | [1] | 104 | 90
Recognized from regulatory asset |  | 0 | 0
Total recognized in net periodic benefit cost |  | 104 | 90
Florida Public Utilities Company Pension Plan [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Prior service cost (credit) |  | 0 | 0
Net loss |  | 128 | 114
Recognized from accumulated other comprehensive loss | [1] | 24 | 22
Recognized from regulatory asset |  | 104 | 92
Total recognized in net periodic benefit cost |  | 128 | 114
Chesapeake Pension SERP [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Prior service cost (credit) |  | 0 | 2
Net loss |  | 22 | 25
Recognized from accumulated other comprehensive loss | [1] | 22 | 27
Recognized from regulatory asset |  | 0 | 0
Total recognized in net periodic benefit cost |  | 22 | 27
Chesapeake Postretirement Plan [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Prior service cost (credit) |  | (20) | (19)
Net loss |  | 18 | 17
Recognized from accumulated other comprehensive loss | [1] | (2) | (2)
Recognized from regulatory asset |  | 0 | 0
Total recognized in net periodic benefit cost |  | (2) | (2)
Florida Public Utilities Company Medical Plan [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Prior service cost (credit) |  | 0 | 0
Net loss |  | 0 | 2
Recognized from accumulated other comprehensive loss | [1] | 0 | 0
Recognized from regulatory asset |  | 0 | 2
Total recognized in net periodic benefit cost |  | $ 0 | $ 2
[1] | (1) See Note 8, Accumulated Other Comprehensive Loss.

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- Definition Defined Benefit Plan Amounts Recognized Gain (Loss) + References No definition available. + Details
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- Definition Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] + References No definition available. + Details
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- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition Amount before tax, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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