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Retirement Plans - Plan's Assets at Fair Value Hierarchy (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value $ 15,183 $ 15,572 $ 19,306
Money Market Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   2,689  
Common/Collective Trust, Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 12,146 3,221  
Common/Collective Trust, Equities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 3,037 5,153  
Common/Collective Trust, Money Market [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   4,509  
(Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 15,183 15,572  
(Level 1) [Member] | Money Market Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   2,689  
(Level 1) [Member] | Common/Collective Trust, Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 12,146 3,221  
(Level 1) [Member] | Common/Collective Trust, Equities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value $ 3,037 5,153  
(Level 1) [Member] | Common/Collective Trust, Money Market [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   4,509  
(Level 2) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   0  
(Level 2) [Member] | Money Market Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   0  
(Level 2) [Member] | Common/Collective Trust, Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   0  
(Level 2) [Member] | Common/Collective Trust, Equities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   0  
(Level 2) [Member] | Common/Collective Trust, Money Market [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   0  
(Level 3) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   0  
(Level 3) [Member] | Money Market Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   0  
(Level 3) [Member] | Common/Collective Trust, Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   0  
(Level 3) [Member] | Common/Collective Trust, Equities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   0  
(Level 3) [Member] | Common/Collective Trust, Money Market [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   $ 0