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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Loss Carryforwards [Line Items]        
Intercompany dividend $ 8,825,000 $ 10,000,000 $ 30,650,000  
Statutory tax rate 34.00% 34.00% 35.00%  
Long-term deferred tax assets $ 11,116,000 $ 6,216,000    
Unremitted foreign earnings available for distribution 14,299,000 22,672,000    
Deferred tax liability 424,000 137,000    
Amount of Unremitted foreign earnings permanently invested 154,581,000 131,327,000    
Amount subject to tax upon repatriation (405,000) 1,968,000 $ (9,000)  
Amount of restricted stock and stock options tax benefits credited to additional paid-in capital   318,000 253,000  
Net increase (decrease) change in the valuation allowance 7,445,000 11,219,000 101,000  
Accrued interest or penalties for income tax liabilities 51,000 0    
Tax benefit reserve 662,000 560,000 560,000 $ 560,000
Impact of effective tax rate 662,000 $ 560,000 $ 560,000  
Deferred tax assets, reserve offset 445,000      
Income tax payable 217,000      
Estimated tax benefit 445,000      
Tax Credit Carry Forwards Expiring On 2023 [Member]        
Operating Loss Carryforwards [Line Items]        
Foreign tax credit carryforwards expire amount $ 2,940,000      
U.S. foreign tax credit carryforwards expiration 2023      
Tax Credit Carry Forwards Expiring On 2026 [Member]        
Operating Loss Carryforwards [Line Items]        
Foreign tax credit carryforwards expire amount $ 4,087,000      
U.S. foreign tax credit carryforwards expiration 2026      
Change in Accounting Method Accounted for as Change in Estimate [Member]        
Operating Loss Carryforwards [Line Items]        
Increase in provision for income taxes $ 169,000      
United States [Member]        
Operating Loss Carryforwards [Line Items]        
Cash in banks 21,733,000      
Outside United States [Member]        
Operating Loss Carryforwards [Line Items]        
Cash in banks 27,612,000      
Amount subject to tax upon repatriation 27,332,000      
Retained earnings to be available for distribution 17,151,000      
Outside United States [Member] | Permanently Invested [Member]        
Operating Loss Carryforwards [Line Items]        
Retained earnings to be available for distribution $ 10,461,000