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Retirement Plans - Plan's Assets at Fair Value Hierarchy (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value $ 15,572 $ 19,306 $ 16,150
Money Market Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 2,689    
Bond Mutual Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0 23  
Common/Collective Trust, Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 3,221 9,980  
Common/Collective Trust, Equities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 5,153 6,654  
Common/Collective Trust, Money Market [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 4,509    
Equity Market Funds, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0 750  
Equity Market Funds, Large Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0 1,085  
Equity Market Funds, Mid Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0 269  
Equity Market Funds, Small Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0 432  
Cash [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   113  
(Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 15,572 19,306  
(Level 1) [Member] | Money Market Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 2,689    
(Level 1) [Member] | Bond Mutual Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0 23  
(Level 1) [Member] | Common/Collective Trust, Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 3,221 9,980  
(Level 1) [Member] | Common/Collective Trust, Equities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 5,153 6,654  
(Level 1) [Member] | Common/Collective Trust, Money Market [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 4,509    
(Level 1) [Member] | Equity Market Funds, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0 750  
(Level 1) [Member] | Equity Market Funds, Large Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0 1,085  
(Level 1) [Member] | Equity Market Funds, Mid Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0 269  
(Level 1) [Member] | Equity Market Funds, Small Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0 432  
(Level 1) [Member] | Cash [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   $ 113  
(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] | Bond Mutual 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 2) [Member] | Equity Market Funds, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0    
(Level 2) [Member] | Equity Market Funds, Large Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0    
(Level 2) [Member] | Equity Market Funds, Mid Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0    
(Level 2) [Member] | Equity Market Funds, Small Cap [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] | Bond Mutual 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    
(Level 3) [Member] | Equity Market Funds, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0    
(Level 3) [Member] | Equity Market Funds, Large Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0    
(Level 3) [Member] | Equity Market Funds, Mid Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 0    
(Level 3) [Member] | Equity Market Funds, Small Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value $ 0