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Benefit Plans - Assets Measured at Fair Value on Recurring Basis (Detail) - Pension - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]        
Total investments $ 54,617 $ 49,932 $ 43,449 $ 46,870
Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 34,901 24,636    
Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 19,716 25,296    
Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 0 0    
Group annuity contracts        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 64 81    
Group annuity contracts | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 0 0    
Group annuity contracts | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 64 81    
Group annuity contracts | Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 0 0    
Mutual funds        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 34,901 24,636    
Mutual funds | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 34,901 24,636    
Mutual funds | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 0 0    
Mutual funds | Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 0 0    
Fixed income        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 25,418 16,609    
Fixed income | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 25,418 16,609    
Fixed income | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 0 0    
Fixed income | Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 0 0    
International equity        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 6,581 5,535    
International equity | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 6,581 5,535    
International equity | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 0 0    
International equity | Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 0 0    
Large US equity        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 1,677 1,496    
Large US equity | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 1,677 1,496    
Large US equity | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 0 0    
Large US equity | Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 0 0    
Small/Mid U.S. equity        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 1,225 996    
Small/Mid U.S. equity | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 1,225 996    
Small/Mid U.S. equity | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 0 0    
Small/Mid U.S. equity | Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 0 0    
Pooled Separate Accounts        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 19,652 25,215    
Pooled Separate Accounts | Level 1        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 0 0    
Pooled Separate Accounts | Level 2        
Defined Benefit Plan Disclosure [Line Items]        
Total investments 19,652 25,215    
Pooled Separate Accounts | Level 3        
Defined Benefit Plan Disclosure [Line Items]        
Total investments $ 0 $ 0