Annual report pursuant to Section 13 and 15(d)

Income Taxes (Detail)

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Income Taxes (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax      
Undistributed earnings of foreign subsidiaries $ 13,100,000    
Tax credit carryforwards 1,000,000    
State tax credit carryforwards subject to expire $ 800,000    
State and foreign tax credit carryforwards expiration beginning year 2017    
State and foreign tax credit carryforwards expiration ending year 2030    
State tax credit carryforwards not subject to expire $ 200,000    
Operating loss carryforwards expiration beginning year 2021    
Operating loss carryforwards expiration ending year 2035    
Tax benefits related to stock option exercises $ 800,000 $ 3,000,000 $ 5,300,000
Penalties or interest liabilities accrued 0 0  
Pretax income 1,600,000 $ 3,600,000 $ 4,300,000
State      
Income Tax      
Operating loss carryforwards expected to be utilized 8,200,000    
Net operating loss carryforwards $ 52,900,000