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Employee Benefit Plans - Composition of Pension Plan Assets by Fair Value Level (Detail) - Defined Benefit Pension Plans - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Total $ 50,260 $ 46,313 $ 40,626
United States      
Defined Benefit Plan Disclosure [Line Items]      
Total 37,260 33,867  
U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Total 13,000 12,446  
Equities | United States      
Defined Benefit Plan Disclosure [Line Items]      
Total 14,636 13,439  
Fixed Income | United States      
Defined Benefit Plan Disclosure [Line Items]      
Total 18,747 16,290  
Cash and Other | United States      
Defined Benefit Plan Disclosure [Line Items]      
Total 3,877 4,138  
Other | U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Total 13,000 12,446  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total 36,957 35,722  
Level 1 | Equities | United States      
Defined Benefit Plan Disclosure [Line Items]      
Total 2,158 3,789  
Level 1 | Fixed Income | United States      
Defined Benefit Plan Disclosure [Line Items]      
Total 18,747 16,290  
Level 1 | Cash and Other | United States      
Defined Benefit Plan Disclosure [Line Items]      
Total 3,052 3,197  
Level 1 | Other | U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Total 13,000 12,446  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Total 538 439  
Level 3 | Equities | United States      
Defined Benefit Plan Disclosure [Line Items]      
Total 538 439  
Assets Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Total 12,765 10,152  
Assets Measured at NAV | Equities | United States      
Defined Benefit Plan Disclosure [Line Items]      
Total 11,940 9,211  
Assets Measured at NAV | Cash and Other | United States      
Defined Benefit Plan Disclosure [Line Items]      
Total $ 825 $ 941