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Assets Measured at Fair Value on Recurring Basis for PBOP Plan (Detail) - Other Postretirement Benefit Plans, Defined Benefit - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value $ 44,770 $ 42,651 $ 32,847
Mutual Fund | Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 20,156 18,882  
Mutual Fund | Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 24,614 23,769  
Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 44,770 42,651  
Fair Value, Inputs, Level 1 | Mutual Fund | Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 20,156 18,882  
Fair Value, Inputs, Level 1 | Mutual Fund | Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value $ 24,614 $ 23,769