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, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax      
Undistributed earnings of foreign subsidiaries $ 11,300,000    
Foreign tax credit $ 800,000    
State and foreign tax credit carryforwards expiration beginning year 2016    
State and foreign tax credit carryforwards expiration ending year 2029    
Operating loss carryforwards expiration beginning year 2023    
Operating loss carryforwards expiration ending year 2035    
Tax benefits related to stock option exercises $ 3,000,000 $ 5,300,000 $ 1,200,000
Penalties or interest liabilities accrued 0 0 0
Penalties or interest expense 0 0 0
Pretax income 3,600,000 $ 4,300,000 200,000
Estimated benefits for research and development tax credits     0
Amount recognized in tax credit     $ 1,100,000
State      
Income Tax      
Operating loss carryforwards expected to be utilized 8,200,000    
Net operating loss carryforwards $ 31,400,000