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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2012
Income Taxes [Line Items]        
Income tax benefit from new interpretation of tax law $ 600,000      
Long-term net deferred tax assets 13,100,000   $ 7,900,000  
Long-term net deferred tax liabilities 204,000   97,000  
Current net deferred tax assets     4,600,000  
Current net deferred tax liabilities     200,000  
Valuation allowance $ 1,534,000 $ 2,200,000 1,565,000 $ 2,086,000
Operating loss carryforwards, expired 2020      
Operating loss carryforwards relate to a prior acquisition $ 4,400,000      
U.S. federal and state capital loss carryforwards 1,100,000      
Deferred tax assets, Capital loss carryforwards expires in 2016 700,000      
Deferred tax assets, Capital loss carryforwards expires in 2018 400,000      
Net tax deficiencies from tax deductions less than book deductions resulting from employee stock option exercises 200,000 300,000    
Undistributed earnings of company's foreign subsidiaries 18,900,000      
Unrecognized tax benefits 1,910,000 $ 2,012,000 2,136,000 $ 1,844,000
Accrued interest and penalties related to uncertain tax positions 200,000   $ 200,000  
Income tax benefits recorded 800,000      
Income tax reserve recorded 0      
Domestic Tax Authority [Member]        
Income Taxes [Line Items]        
Operating loss carryforwards 3,000,000      
Foreign Tax Authority [Member]        
Income Taxes [Line Items]        
Operating loss carryforwards $ 22,100,000