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Assets Measured at Fair Value on Recurring Basis for Pension Plan (Detail) - Pension Plans - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value $ 107,808 $ 102,315 $ 91,058
Mutual Fund      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 96,165 91,528  
Mutual Fund | Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 52,884 50,373  
Mutual Fund | Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 43,281 34,757  
Mutual Fund | Asset Allocation Fund      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value   6,398  
Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 1,202 1,200  
Mutual Fund Including Cash And Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 97,367 92,728  
Real Estate Funds      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 10,441 9,587  
Fair Value, Inputs, Level 1 | Mutual Fund      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 96,165 91,528  
Fair Value, Inputs, Level 1 | Mutual Fund | Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 52,884 50,373  
Fair Value, Inputs, Level 1 | Mutual Fund | Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 43,281 34,757  
Fair Value, Inputs, Level 1 | Mutual Fund | Asset Allocation Fund      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value   6,398  
Fair Value, Inputs, Level 1 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 1,202 1,200  
Fair Value, Inputs, Level 1 | Mutual Fund Including Cash And Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value $ 97,367 $ 92,728