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Employee Benefit Plans (Pension Benefit Plan) - Schedule of Cash Equivalents and Investments Held at Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 24,159 $ 26,624 $ 20,045
Pension Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 24,159 26,624  
Pension Benefit Plan [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 24,159 26,624  
Pension Benefit Plan [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,010 3,005  
Pension Benefit Plan [Member] | Cash and Cash Equivalents [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,010 3,005  
Pension Benefit Plan [Member] | Corporate Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,840 14,349  
Pension Benefit Plan [Member] | Corporate Bonds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,840 14,349  
Pension Benefit Plan [Member] | Government Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6,268 2,305  
Pension Benefit Plan [Member] | Government Bonds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6,268 2,305  
Pension Benefit Plan [Member] | Emerging Markets Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 443    
Pension Benefit Plan [Member] | Emerging Markets Bonds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 443    
Pension Benefit Plan [Member] | Global Equity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7,743    
Pension Benefit Plan [Member] | Global Equity [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7,743    
Pension Benefit Plan [Member] | Large Cap Value [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 262 309  
Pension Benefit Plan [Member] | Large Cap Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 262 309  
Pension Benefit Plan [Member] | Emerging Markets [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,188    
Pension Benefit Plan [Member] | Emerging Markets [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,188    
Pension Benefit Plan [Member] | Balanced Fund [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 815 898  
Pension Benefit Plan [Member] | Balanced Fund [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 815 898  
Pension Benefit Plan [Member] | Available-For-Sale Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 23,149 23,619  
Pension Benefit Plan [Member] | Available-For-Sale Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 23,149 23,619  
Pension Benefit Plan [Member] | Global Real Estate Fund [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 926    
Pension Benefit Plan [Member] | Global Real Estate Fund [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 926    
Pension Benefit Plan [Member] | Managed Futures Fund [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 664    
Pension Benefit Plan [Member] | Managed Futures Fund [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 664    
Pension Benefit Plan [Member] | Large Cap Blend [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   5,758  
Pension Benefit Plan [Member] | Large Cap Blend [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   $ 5,758