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Stock Option Plans and Restricted Stock Grants - Option Activity Under Company's Stock Option Plans (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Stock Option Activity [Line Items]      
Outstanding, Number of Stock Options, Beginning Balance 2,865,000    
Granted, Number of Stock Options Outstanding 248,000 31,000 397,000
Exercised, Number of Stock Options Outstanding (292,000)    
Forfeited or expired, Number of Stock Options Outstanding (217,000)    
Outstanding, Number of Stock Options, Ending Balance 2,604,000 2,865,000  
Vested or expected to vest, Number of Stock Options 2,470,000    
Exercisable, Number of Stock Options 1,861,000    
Outstanding, Weighted Average Exercise Price, Beginning Balance $ 10.41    
Granted, Weighted Average Exercise Price $ 11.71    
Exercised, Weighted Average Exercise Price $ 8.74    
Forfeited or expired, Weighted Average Exercise Price $ 11.26    
Outstanding, Weighted Average Exercise Price, Ending Balance $ 10.66 $ 10.41  
Vested or expected to vest, Weighted Average Exercise Price $ 10.72    
Exercisable, Weighted Average Exercise Price $ 11.09    
Outstanding, Weighted Average Remaining Contractual Term 4 years 9 months    
Vested or expected to vest, Weighted Average Remaining Contractual Term 4 years 7 months 6 days    
Exercisable, Weighted Average Remaining Contractual Term 3 years 6 months 29 days    
Outstanding, Aggregate Intrinsic Value $ 2,296    
Vested or expected to vest, Aggregate Intrinsic Value 2,120    
Exercisable, Aggregate Intrinsic Value $ 1,369