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Benefit Plans - Summary of Stock Option Activity (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Stock Option Activity [Line Items]      
Weighted-Average Exercise Price, Beginning balance $ 25.70 $ 25.35 $ 28.28
Weighted-Average Exercise Price, Granted $ 16.91 $ 13.87 $ 13.72
Weighted-Average Exercise Price, Exercised $ 9.25 $ 6.54 $ 6.39
Weighted-Average Exercise Price, Forfeited $ 28.10 $ 26.21 $ 41.02
Weighted-Average Exercise Price, Ending balance $ 24.77 $ 25.70 $ 25.35
Weighted-Average Exercise Price, Options exercisable $ 27.53 $ 29.12 $ 28.00
Weighted-Average Remaining Contractual Term (years), Ending Balance 5 years 1 month 6 days    
Weighted-Average Remaining Contractual Term (years), Options exercisable 4 years 1 month 6 days 4 years 6 months 5 years 2 months 12 days
Aggregate Intrinsic Value, Ending balance $ 6,919    
Aggregate Intrinsic Value, Options exercisable $ 6,491 $ 6,538 $ 5,177
Employees [Member]
      
Schedule Of Stock Option Activity [Line Items]      
Number of Options Outstanding, Beginning Balance 2,596 2,683 3,223
Number of Options, Granted 345 345 276
Number of Options, Exercised (87) (266) (192)
Number of Options, Forfeited (193) (166) (624)
Number of Options Outstanding, Ending Balance 2,661 2,596 2,683
Number of Options exercisable 2,052 2,035 2,230
Directors [Member]
      
Schedule Of Stock Option Activity [Line Items]      
Number of Options Outstanding, Beginning Balance 0 10 20
Number of Options, Granted 0 0 0
Number of Options, Exercised 0 0 0
Number of Options, Forfeited 0 (10) (10)
Number of Options Outstanding, Ending Balance 0 0 10
Number of Options exercisable 0 0 10