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Derivative Instruments - Effects of Gains and Losses from Derivative Instruments (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]      
Energy Marketing Contract Liabilities, Current $ 354 $ 585  
Gain (Loss) on derivatives 584 3,517 $ 6,586
Derivatives not designated as hedging instruments | Propane Swap Agreement      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net $ 0 $ 56 $ (1)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Propane and natural gas costs Propane and natural gas costs Propane and natural gas costs
Derivatives designated as fair value hedges | Put Or Call Option [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net $ 0 $ 0 $ (24)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Propane and natural gas costs Propane and natural gas costs Propane and natural gas costs
Derivatives designated as fair value hedges | Propane Swap Agreement | Revenue      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net $ 1,221 $ (373) $ (536)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Revenues Revenues Revenues
Derivatives designated as fair value hedges | Propane Swap Agreement | Cost of Sales      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net $ (1,160) $ 3,881 $ 7,187
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Propane and natural gas costs    
Derivatives designated as fair value hedges | Interest Rate Swap [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net $ 523 $ (47) $ (40)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest charges Interest charges Interest charges
Mark To Market Energy Liabilities [Member] | Derivatives designated as fair value hedges | Propane Swap Agreement      
Derivative Instruments, Gain (Loss) [Line Items]      
Energy Marketing Contract Liabilities, Current [1] $ 1,078 $ 1,810  
Mark To Market Energy Liabilities [Member] | Derivatives designated as fair value hedges | Interest Rate Swap [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Energy Marketing Contract Liabilities, Current [1] $ 203 $ 405  
[1] (1) Derivative liabilities, at fair value include $0.4 million and $0.6 million in current liabilities in the consolidated balance sheet at December 31, 2023 and 2022, respectively, with the remainder of the balance classified as long-term.