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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Total $ 46,313 $ 40,626 $ 44,222
United States      
Defined Benefit Plan Disclosure [Line Items]      
Total 33,867 30,122  
U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Total 12,446 10,504  
Equities | United States      
Defined Benefit Plan Disclosure [Line Items]      
Total 13,439 11,353  
Fixed Income | United States      
Defined Benefit Plan Disclosure [Line Items]      
Total 16,290 13,856  
Cash and Other | United States      
Defined Benefit Plan Disclosure [Line Items]      
Total 4,138 3,250  
CMRT | United States      
Defined Benefit Plan Disclosure [Line Items]      
Total   1,663  
Other | U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Total 12,446 10,504  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total 35,722 30,130  
Level 1 | Equities | United States      
Defined Benefit Plan Disclosure [Line Items]      
Total 3,789 3,423  
Level 1 | Fixed Income | United States      
Defined Benefit Plan Disclosure [Line Items]      
Total 16,290 13,856  
Level 1 | Cash and Other | United States      
Defined Benefit Plan Disclosure [Line Items]      
Total 3,197 2,347  
Level 1 | Other | U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Total 12,446 10,504  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Total 439 1,663  
Level 3 | Equities | United States      
Defined Benefit Plan Disclosure [Line Items]      
Total 439    
Level 3 | CMRT | United States      
Defined Benefit Plan Disclosure [Line Items]      
Total   1,663  
Assets Measured at NAV      
Defined Benefit Plan Disclosure [Line Items]      
Total 10,152 8,833  
Assets Measured at NAV | Equities | United States      
Defined Benefit Plan Disclosure [Line Items]      
Total 9,211 7,930  
Assets Measured at NAV | Cash and Other | United States      
Defined Benefit Plan Disclosure [Line Items]      
Total $ 941 $ 903