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Segment Information - Reconciliation of Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Disclosure Of Operating Segments [Line Items]        
Total assets $ 298,911 $ 305,798    
Investment in associates 935 864    
Deferred tax assets 3,939 3,919 $ 3,026 $ 3,022
Total liabilities 70,476 83,982    
Deferred tax liabilities 4,139 3,925    
Operating segments [Member]        
Disclosure Of Operating Segments [Line Items]        
Total assets 291,576 298,222    
Total liabilities 62,752 77,071    
Eliminations [Member]        
Disclosure Of Operating Segments [Line Items]        
Total assets (5) (76)    
Total liabilities (6) (33)    
Segment Reconciling Items [Member]        
Disclosure Of Operating Segments [Line Items]        
Corporate and other assets 2,466 2,869    
Investment in associates 935 864    
Deferred tax assets 3,939 3,919    
Corporate liabilities 3,591 3,019    
Deferred tax liabilities $ 4,139 $ 3,925