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Assets Measured at Fair Value on Recurring Basis for Pension Plan (Detail) - Pension Plans - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value $ 125,755 $ 107,808 $ 102,315
Mutual Fund      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 113,828 96,165  
Mutual Fund | Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 68,848 52,884  
Mutual Fund | Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 44,980 43,281  
Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 750 1,202  
Mutual Fund Including Cash And Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 114,578 97,367  
Real Estate Funds      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 11,177 10,441  
Fair Value, Inputs, Level 1 | Mutual Fund      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 113,828 96,165  
Fair Value, Inputs, Level 1 | Mutual Fund | Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 68,848 52,884  
Fair Value, Inputs, Level 1 | Mutual Fund | Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 44,980 43,281  
Fair Value, Inputs, Level 1 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value 750 1,202  
Fair Value, Inputs, Level 1 | Mutual Fund Including Cash And Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets measured at fair value $ 114,578 $ 97,367