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Employee Benefit Plans (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]        
Amortization of prior service cost $ (20) $ (20) $ (39) $ (40)
Amortization of net loss 276 270 551 541
Chesapeake Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Contributions by Employer 119   167  
Interest cost 103 105 206 210
Expected return on plan assets (127) (131) (254) (261)
Amortization of prior service cost 0 0 0 0
Amortization of net loss 106 103 213 206
Net periodic cost (benefit) 82 77 165 155
Amortization of pre-merger regulatory asset 0 0 0 0
Total periodic cost 82 77 165 155
Florida Public Utilities Company Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Contributions by Employer 1,154   1,529  
Interest cost 624 630 1,247 1,259
Expected return on plan assets (700) (701) (1,399) (1,402)
Amortization of prior service cost 0 0 0 0
Amortization of net loss 131 128 262 257
Net periodic cost (benefit) 55 57 110 114
Amortization of pre-merger regulatory asset 191 191 381 381
Total periodic cost 246 248 491 495
Chesapeake Pension SERP [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Contributions by Employer 38   76  
Interest cost 22 23 44 46
Expected return on plan assets 0 0 0 0
Amortization of prior service cost 0 0 0 0
Amortization of net loss 22 22 44 44
Net periodic cost (benefit) 44 45 88 90
Amortization of pre-merger regulatory asset 0 0 0 0
Total periodic cost 44 45 88 90
Chesapeake Postretirement Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Contributions by Employer 17,102   64,632  
Interest cost 11 11 21 21
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (20) (20) (39) (40)
Amortization of net loss 17 17 32 34
Net periodic cost (benefit) 8 8 14 15
Amortization of pre-merger regulatory asset 0 0 0 0
Total periodic cost 8 8 14 15
Florida Public Utilities Company Medical Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Contributions by Employer 18,477   35,511  
Interest cost 13 14 26 28
Expected return on plan assets 0 0 0 0
Amortization of prior service cost 0 0 0 0
Amortization of net loss 0 0 0 0
Net periodic cost (benefit) 13 14 26 28
Amortization of pre-merger regulatory asset 2 2 4 4
Total periodic cost $ 15 $ 16 $ 30 $ 32