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Segment Information - Reconciliation of Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Operating Segments [Line Items]      
Total assets   $ 334,843 $ 293,596
Investment in associates   861 786
Deferred tax assets $ 3,026 3,022 3,114
Total liabilities   112,017 96,421
Deferred tax liabilities   3,154 2,588
Operating segments [Member]      
Disclosure Of Operating Segments [Line Items]      
Total assets   330,923 290,994
Total liabilities   106,452 92,770
Corporate expense adjustments [Member]      
Disclosure Of Operating Segments [Line Items]      
Corporate and other assets   2,916 2,928
Investment in associates   861 786
Deferred tax assets   3,022 3,114
Corporate liabilities   5,287 5,257
Deferred tax liabilities   3,154 2,588
Eliminations [Member]      
Disclosure Of Operating Segments [Line Items]      
Total assets   (2,879) (4,226)
Total liabilities   $ (2,876) $ (4,194)