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Employee Benefit Plans - Employee Benefit Plans (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Defined Benefit Plan Disclosure [Line Items]        
Document Period End Date     Sep. 30, 2014  
Amortization of prior service cost $ (14) $ (14) $ (44) $ (45)
Amortization of net loss 65 172 198 517
Chesapeake Pension Plan [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 107 102 320 307
Expected return on plan assets (133) (126) (398) (378)
Amortization of prior service cost 0 0 0 (1)
Amortization of net loss 37 57 112 171
Net periodic cost (benefit) 11 33 34 99
Total periodic cost 11 33 34 99
FPU Pension Plan [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 647 594 1,941 1,782
Expected return on plan assets (773) (719) (2,318) (2,156)
Amortization of net loss 0 81 0 243
Net periodic cost (benefit) (126) (44) (377) (131)
Amortization of pre-merger regulatory asset 191 191 571 571
Total periodic cost 65 147 194 440
Chesapeake Pension SERP [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 23 21 69 62
Amortization of prior service cost 5 5 14 14
Amortization of net loss 12 16 36 48
Net periodic cost (benefit) 40 42 119 124
Total periodic cost 40 42 119 124
Chesapeake Postretirement Plan [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 13 12 39 36
Amortization of prior service cost (19) (19) (58) (58)
Amortization of net loss 16 18 50 55
Net periodic cost (benefit) 10 11 31 33
Total periodic cost 10 11 31 33
FPU Medical Plan [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 17 16 50 47
Amortization of net loss 0 0 0 0
Net periodic cost (benefit) 17 16 50 47
Amortization of pre-merger regulatory asset 2 2 6 6
Total periodic cost $ 19 $ 18 $ 56 $ 53