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Segment Information - Reconciliation of Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Disclosure Of Operating Segments [Line Items]      
Total assets $ 305,798   $ 334,843
Investment in associates 864   861
Deferred tax assets 3,919 $ 3,026 3,022
Total liabilities 83,982   112,017
Deferred tax liabilities 3,925   3,154
Operating segments [Member]      
Disclosure Of Operating Segments [Line Items]      
Total assets 298,222   330,923
Total liabilities 77,071   106,452
Corporate expense adjustments [Member]      
Disclosure Of Operating Segments [Line Items]      
Corporate and other assets 2,869   2,916
Investment in associates 864   861
Deferred tax assets 3,919   3,022
Corporate liabilities 3,019   5,287
Deferred tax liabilities 3,925   3,154
Eliminations [Member]      
Disclosure Of Operating Segments [Line Items]      
Total assets (76)   (2,879)
Total liabilities $ (33)   $ (2,876)