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Summary of Stock Option Activity and Related Information (Detail) - $ / shares
shares in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Number of Options Shares      
Outstanding at beginning period 1,058 1,410 1,697
Options forfeited (143)    
Options exercised (336) (352) (287)
Outstanding at ending period 579 1,058 1,410
Options vested and expected to vest after ending period 579 1,058 1,410
Options exercisable at ending period 579    
Weighted Average Exercise Price      
Outstanding at beginning period $ 1.47 $ 1.47 $ 1.47
Options forfeited 1.47    
Options exercised 1.47 1.46 1.47
Outstanding at ending period 1.47 1.47 $ 1.47
Options vested and expected to vest after ending period 1.47 1.47  
Options exercisable at ending period 1.47    
Options vested and expected to vest after ending period $ 1.47 $ 1.47  
Weighted Average Remaining Contractual Life      
Outstanding at ending period 11 months 1 day 1 year 4 months 6 days 2 years 1 month 21 days
Options vested and expected to vest after ending period 11 months 1 day 1 year 4 months 6 days 2 years 1 month 21 days
Options exercisable at ending period 11 months 1 day