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Retirement Plans - Plan's Assets at Fair Value Hierarchy (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value $ 15,647 $ 16,184 $ 15,466
Supplemental Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 15,647    
Supplemental Retirement Plan [Member] | Cash [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   3  
Supplemental Retirement Plan [Member] | Money Market Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 94 91  
Supplemental Retirement Plan [Member] | Bond Mutual Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 23 23  
Supplemental Retirement Plan [Member] | Common/Collective Trust, Equities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 6,315 6,383  
Supplemental Retirement Plan [Member] | Equity Market Funds, Commodity Mutual Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   19  
Supplemental Retirement Plan [Member] | Equity Market Funds, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 357 342  
Supplemental Retirement Plan [Member] | Equity Market Funds, Large Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 1,155 1,150  
Supplemental Retirement Plan [Member] | Equity Market Funds, Mid Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 242 253  
Supplemental Retirement Plan [Member] | Equity Market Funds, Small Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 123 118  
Supplemental Retirement Plan [Member] | Common/Collective Trust, Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 7,338 7,802  
(Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   16,184  
(Level 1) [Member] | Supplemental Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 15,647    
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Cash [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   3  
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Money Market Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 94 91  
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Bond Mutual Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 23 23  
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Common/Collective Trust, Equities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 6,315 6,383  
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Equity Market Funds, Commodity Mutual Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value   19  
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Equity Market Funds, International [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 357 342  
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Equity Market Funds, Large Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 1,155 1,150  
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Equity Market Funds, Mid Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 242 253  
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Equity Market Funds, Small Cap [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value 123 118  
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Common/Collective Trust, Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Total assets at fair value $ 7,338 $ 7,802