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Fair Value Accounting, Commodity Contracts (Details)
$ in Thousands, MWh in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
MMBTU
MWh
Sep. 30, 2016
USD ($)
Apr. 12, 2016
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
MMBTU
MWh
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
MMBTU
MWh
Price Risk Derivative | Derivatives Not Designated As Hedging Instrument              
FTRs, at Fair Value, Net [Abstract]              
Commodity-related contracts, net $ 12,887       $ 12,887   $ 7,683
FTRs [Abstract]              
Net gain (loss) on FTRs recognized in income 6,295 $ 4,652          
Price Risk Derivative | Derivatives Not Designated As Hedging Instrument | Energy risk management assets              
FTRs, at Fair Value, Net [Abstract]              
FTRs in energy risk management assets 13,425       13,425   7,884
Price Risk Derivative | Derivatives Not Designated As Hedging Instrument | Energy risk management liabilities              
FTRs, at Fair Value, Net [Abstract]              
FTRs in Energy risk management liabilities 538       538   $ 201
Price Risk Derivative | Derivatives Not Designated As Hedging Instrument | Accumulated deferred fuel              
FTRs [Abstract]              
Unrealized gains (losses) associated with FTRs not recognized in income on derivatives 1,600       (800)    
Price Risk Derivative | Derivatives Not Designated As Hedging Instrument | Electric operations              
FTRs [Abstract]              
Gain on FTRs recognized in income 14,062 9,718          
Price Risk Derivative | Derivatives Not Designated As Hedging Instrument | Power purchased for utility customers              
FTRs [Abstract]              
Loss on FTRs recognized in income $ (7,767) (5,066)          
Predecessor | Price Risk Derivative | Derivatives Not Designated As Hedging Instrument              
FTRs [Abstract]              
Net gain (loss) on FTRs recognized in income     $ 2,802        
Predecessor | Price Risk Derivative | Derivatives Not Designated As Hedging Instrument | Accumulated deferred fuel              
FTRs [Abstract]              
Unrealized gains (losses) associated with FTRs not recognized in income on derivatives     (1,000)        
Predecessor | Price Risk Derivative | Derivatives Not Designated As Hedging Instrument | Electric operations              
FTRs [Abstract]              
Gain on FTRs recognized in income     8,563        
Predecessor | Price Risk Derivative | Derivatives Not Designated As Hedging Instrument | Power purchased for utility customers              
FTRs [Abstract]              
Loss on FTRs recognized in income     $ (5,761)        
Successor | Price Risk Derivative | Derivatives Not Designated As Hedging Instrument              
FTRs [Abstract]              
Net gain (loss) on FTRs recognized in income       $ 11,725 16,413    
Successor | Price Risk Derivative | Derivatives Not Designated As Hedging Instrument | Accumulated deferred fuel              
FTRs [Abstract]              
Unrealized gains (losses) associated with FTRs not recognized in income on derivatives   1,800   2,500      
Successor | Price Risk Derivative | Derivatives Not Designated As Hedging Instrument | Electric operations              
FTRs [Abstract]              
Gain on FTRs recognized in income       23,467 35,172    
Successor | Price Risk Derivative | Derivatives Not Designated As Hedging Instrument | Power purchased for utility customers              
FTRs [Abstract]              
Loss on FTRs recognized in income       $ (11,742) $ (18,759)    
Cleco Power [Member]              
FTRs [Abstract]              
Volume of FTRs Held (MWh) | MWh 14.4       14.4   9.0
Cleco Power [Member] | Price Risk Derivative | Derivatives Not Designated As Hedging Instrument              
FTRs, at Fair Value, Net [Abstract]              
Commodity-related contracts, net $ 12,887       $ 12,887   $ 7,683
FTRs [Abstract]              
Net gain (loss) on FTRs recognized in income 6,295 4,652     16,413 $ 14,527  
Cleco Power [Member] | Price Risk Derivative | Derivatives Not Designated As Hedging Instrument | Energy risk management assets              
FTRs, at Fair Value, Net [Abstract]              
FTRs in energy risk management assets 13,425       13,425   7,884
Cleco Power [Member] | Price Risk Derivative | Derivatives Not Designated As Hedging Instrument | Energy risk management liabilities              
FTRs, at Fair Value, Net [Abstract]              
FTRs in Energy risk management liabilities 538       538   $ 201
Cleco Power [Member] | Price Risk Derivative | Derivatives Not Designated As Hedging Instrument | Accumulated deferred fuel              
FTRs [Abstract]              
Unrealized gains (losses) associated with FTRs not recognized in income on derivatives 1,600 1,800     (800) 1,500  
Cleco Power [Member] | Price Risk Derivative | Derivatives Not Designated As Hedging Instrument | Electric operations              
FTRs [Abstract]              
Gain on FTRs recognized in income 14,062 9,718     35,172 32,030  
Cleco Power [Member] | Price Risk Derivative | Derivatives Not Designated As Hedging Instrument | Power purchased for utility customers              
FTRs [Abstract]              
Loss on FTRs recognized in income $ (7,767) $ (5,066)     $ (18,759) $ (17,503)  
Cleco Power [Member] | Open Natural Gas Positions              
FTRs [Abstract]              
Number of open natural gas positions | MMBTU 0       0   0