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Pension and Employee Benefit Plans - Disclosure of Fair Value Measurements of Pension Plan Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Pension assets, at fair value $ 27,099 $ 24,197
Equity Securities [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Pension assets, at fair value 19,702 16,994
Debt Securities [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Pension assets, at fair value 6,819 6,518
Level 1 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Pension assets, at fair value 27,099 24,197
Level 1 [Member] | Equity Securities [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Pension assets, at fair value 19,702 16,994
Level 1 [Member] | Debt Securities [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Pension assets, at fair value 6,819 6,518
Cash and cash equivalents [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Pension assets, at fair value 578 685
Cash and cash equivalents [Member] | Level 1 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Pension assets, at fair value $ 578 $ 685