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Employee Benefit Plans (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |
Amortization of prior service cost | $ (20) | $ (17)
Amortization of net loss | 272 | 248
Florida Public Utilities Company Medical Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 14 | 15
Expected return on plan assets | 0 | 0
Amortization of prior service cost | 0 | 0
Amortization of net loss | 0 | 2
Net periodic cost (benefit) | 14 | 17
Amortization of pre-merger regulatory asset | 2 | 2
Total periodic cost | 16 | 19
Chesapeake Postretirement Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 11 | 11
Expected return on plan assets | 0 | 0
Amortization of prior service cost | (20) | (19)
Amortization of net loss | 18 | 17
Net periodic cost (benefit) | 9 | 9
Amortization of pre-merger regulatory asset | 0 | 0
Total periodic cost | 9 | 9
Chesapeake Pension SERP [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 23 | 23
Expected return on plan assets | 0 | 0
Amortization of prior service cost | 0 | 2
Amortization of net loss | 22 | 25
Net periodic cost (benefit) | 45 | 50
Amortization of pre-merger regulatory asset | 0 | 0
Total periodic cost | 45 | 50
Florida Public Utilities Company Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 630 | 626
Expected return on plan assets | (701) | (777)
Amortization of prior service cost | 0 | 0
Amortization of net loss | 128 | 114
Net periodic cost (benefit) | 57 | (37)
Amortization of pre-merger regulatory asset | 191 | 190
Total periodic cost | 248 | 153
Chesapeake Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 105 | 102
Expected return on plan assets | (131) | (135)
Amortization of prior service cost | 0 | 0
Amortization of net loss | 104 | 90
Net periodic cost (benefit) | 78 | 57
Amortization of pre-merger regulatory asset | 0 | 0
Total periodic cost | $ 78 | $ 57

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- Definition Amortization of pre-merger regulatory asset. + References No definition available. + Details
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- Definition Periodic Cost Benefit + 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 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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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + 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 The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + 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)(2) -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 -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + 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) -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 -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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