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Stock Option Plans and Restricted Stock Awards - Option Activity under Company's Stock Option Plans (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Outstanding, Number of Stock Options, Beginning Balance 2,604    
Granted, Number of Stock Options Outstanding 45 248 31
Exercised, Number of Stock Options Outstanding (428)    
Forfeited or expired, Number of Stock Options Outstanding (115)    
Outstanding, Number of Stock Options, Ending Balance 2,106 2,604  
Vested or expected to vest, Number of Stock Options Outstanding 2,033    
Exercisable, Number of Stock Options Outstanding 1,635    
Outstanding, Weighted Average Exercise Price, Beginning Balance $ 10.66    
Granted, Weighted Average Exercise Price $ 12.39    
Exercised, Weighted Average Exercise Price $ 10.55    
Forfeited or expired, Weighted Average Exercise Price $ 12.60    
Outstanding, Weighted Average Exercise Price, Ending Balance $ 10.61 $ 10.66  
Vested or expected to vest, Weighted Average Exercise Price $ 10.62    
Exercisable, Weighted Average Exercise Price $ 10.78    
Outstanding, Weighted Average Remaining Contractual Term 4 years 7 months 17 days    
Vested or expected to vest, Weighted Average Remaining Contractual Term 4 years 6 months 11 days    
Exercisable, Weighted Average Remaining Contractual Term 3 years 10 months 17 days    
Outstanding, Aggregate Intrinsic Value $ 13,607    
Vested or expected to vest, Aggregate Intrinsic Value 13,112    
Exercisable, Aggregate Intrinsic Value $ 10,286