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Employee Benefit Plans - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended 54 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Jan. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Y
Dec. 31, 2012
Rabbi Trust [Member]
Dec. 31, 2011
Rabbi Trust [Member]
Dec. 31, 2010
Employee contribution up to first six percentage [Member]
Dec. 31, 2010
Two-percent contribution [Member]
Dec. 31, 2012
FPU [Member]
Dec. 31, 2011
FPU [Member]
Dec. 31, 2010
FPU [Member]
Dec. 31, 2010
FPU [Member]
Employee contribution up to first two percentage [Member]
Dec. 31, 2010
FPU [Member]
Employee pre-tax contributions on next four percentage [Member]
Dec. 31, 2010
FPU [Member]
Employee contribution up to first six percentage [Member]
Dec. 31, 2012
Chesapeake Pension Plan [Member]
Dec. 31, 2011
Chesapeake Pension Plan [Member]
Jan. 31, 2011
Chesapeake Pension Plan [Member]
Chief Executive Officer [Member]
Jan. 31, 2011
Chesapeake Pension Plan [Member]
Maximum [Member]
Dec. 31, 2010
Chesapeake Pension Plan [Member]
Employee contribution up to first six percentage [Member]
Minimum [Member]
Dec. 31, 2010
Chesapeake Pension Plan [Member]
Employee contribution up to first six percentage [Member]
Maximum [Member]
Dec. 31, 2012
Chesapeake SERP [Member]
Dec. 31, 2011
Chesapeake SERP [Member]
Jan. 31, 2011
Chesapeake SERP [Member]
Chief Executive Officer [Member]
Dec. 31, 2012
Medical [Member]
Dec. 31, 2012
Chesapeake Postretirement Plan [Member]
Dec. 31, 2012
FPU Medical Plan [Member]
Dec. 31, 2012
FPU Medical Plan [Member]
Unregulated operations [Member]
Dec. 31, 2012
FPU Medical Plan [Member]
Regulated liability [Member]
Dec. 31, 2012
FPU Pension Plan [Member]
Dec. 31, 2011
FPU Pension Plan [Member]
Dec. 31, 2010
Plan 401 k [Member]
Dec. 31, 2010
Chesapeake [Member]
Dec. 31, 2010
Chesapeake [Member]
Minimum [Member]
Y
Dec. 31, 2010
Chesapeake [Member]
Maximum [Member]
Y
Defined Benefit Plan Disclosure [Line Items]                                                                    
Pre-merger regulatory asset   $ 5,171,000                                               $ 62,000     $ 5,109,000          
Total unrecognized cost   26,146,000 23,100,000 13,900,000                     4,378,000           904,000       158,000 80,000     20,626,000          
Curtailment gain                                                   892,000                
Curtailment gain, unregulated operations                                                     170,000              
Curtailment gain, regulatory liability                                                       722,000            
Lump-sum pension distributions                               844,000 844,000         765,000 765,000                      
Pension settlement losses on lump-sum payment distributions 436,000                             (217,000)           (219,000)                        
Maximum percent of benefit obligation required                             6.00% 6.00%   110.00%                     7.00% 7.00%        
Escrow deposit percent 125.00%                                                                  
Unfunded accumulated benefit obligation                             3,503,000 4,510,000         2,352,000 2,160,000             22,558,000 20,163,000        
Expected amortization of pre-merger regulatory asset                 8,000 8,000 9,000                                              
Health care inflation rate                                               6.00% 7.00% 7.50%                
One-percentage point increase in health care inflation rate, accumulated postretirement benefit obligation   255,000                                                                
One-percentage point increase in health care inflation rate, service cost and interest cost components   11,000                                                                
One-percentage point decrease in health care inflation rate, accumulated postretirement benefit obligation   222,000                                                                
One-percentage point decrease in health care inflation rate, service cost and interest cost components   10,000                                                                
Expected contribution                             564,000           88,000       97,000 258,000     2,816,000          
Percentage of eligible participants contribution to the plan                                                             100.00%      
Maximum percentage of eligible compensation       6.00%                                                            
Employer matching contribution vested, percentage       100.00%       20.00%     100.00%                                           20.00% 100.00%
Employer matching contribution vested, period       2                                                         1 2
Employee contribution age       55                                                            
Deferral rate                                                               3.00%    
Deferral rate increase, minimum                                                               1.00%    
Deferral rate increase, maximum                                                               6.00%    
Assets held in trust fair value         2,200,000 1,700,000                                                        
Employer matching contribution, percentage             50.00%       50.00% 100.00% 50.00% 3.00%         100.00% 200.00%                            
Employer contributions to pension plan   2,900,000 2,700,000 1,700,000                     1,342,000 1,048,000         89,000 854,000             2,571,000 1,313,000        
Shares reserved to fund future contributions   580,484                                                                
Deferred Compensation Plan   $ 982,000 $ 817,000