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Summary of Stock Option Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Shares Under Option        
Shares Under Option, Outstanding Beginning Balance 738,792 1,384,537 1,875,170  
Shares Under Option, Granted         
Shares Under Option, Exercised (115,847) (645,745) (52,589)  
Shares Under Option, Forfeited      (438,044)  
Shares Under Option, Expired         
Shares Under Option, Outstanding Ending Balance 622,945 738,792 1,384,537 1,875,170
Shares Under Option, Ending vested and expected to vest 622,945      
Shares Under Option, Exercisable 422,945 162,792 396,985  
Weighted-Average Exercise Price        
Weighted-Average Exercise Price, Outstanding Beginning Balance $ 18.39 $ 17.58 $ 17.53  
Weighted-Average Exercise Price, Granted         
Weighted-Average Exercise Price, Exercised $ 17.56 $ 16.64 $ 18.48  
Weighted-Average Exercise Price, Forfeited     $ 17.28  
Weighted-Average Exercise Price, Expired         
Weighted-Average Exercise Price, Outstanding Ending Balance $ 18.55 $ 18.39 $ 17.58 $ 17.53
Weighted-Average Exercise Price, Ending vested and expected to vest $ 18.55      
Weighted-Average Exercise Price, Exercisable $ 18.48 $ 17.82 $ 18.16  
Weighted-Average Remaining Contractual Term        
Weighted-Average Remaining Contractual Term, Outstanding 4 years 1 month 6 days 4 years 10 months 24 days 4 years 4 months 24 days 5 years 4 months 24 days
Weighted-Average Remaining Contractual Term, Ending vested and expected to vest 4 years 1 month 6 days      
Weighted-Average Remaining Contractual Term, Exercisable 4 years 2 months 12 days 4 years 5 years 4 months 24 days  
Aggregate Intrinsic Value        
Aggregate Intrinsic Value, Outstanding Beginning Balance $ 8,891 $ 14,587 $ 17,147  
Aggregate Intrinsic Value, Outstanding Ending balance 7,289 8,891 14,587 17,147
Aggregate Intrinsic Value, Ending vested and expected to vest 7,289      
Aggregate Intrinsic Value, Exercisable $ 5,460 $ 1,243 $ 1,774