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Pension and Employee Benefit Plans - Disclosure of Fair Value Measurements of Pension Plan Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Pension assets, at fair value $ 24,197 $ 26,836
Equity Securities [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Pension assets, at fair value 16,994 18,722
Debt Securities [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Pension assets, at fair value 6,518 6,967
Level 1 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Pension assets, at fair value 24,197 26,836
Level 1 [Member] | Equity Securities [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Pension assets, at fair value 16,994 18,722
Level 1 [Member] | Debt Securities [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Pension assets, at fair value 6,518 6,967
Cash and cash equivalents [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Pension assets, at fair value 685 1,147
Cash and cash equivalents [Member] | Level 1 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]    
Pension assets, at fair value $ 685 $ 1,147