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Treasury Stock Acquisition (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of Treasury Stock [Line Items]      
Treasury stock acquired, Shares, Beginning balance 38,146,738 27,487,571 27,343,814
Treasury stock acquired, Shares, Ending balance 42,268,057 38,146,738 27,487,571
Treasury stock acquired, Values, Beginning balance $ 795,051 $ 624,759 $ 620,445
Treasury stock acquired, Values 85,837 170,292 4,314
Treasury stock acquired, Values, Ending balance 880,888 795,051 624,759
2007 Program
      
Schedule of Treasury Stock [Line Items]      
Treasury stock acquired, Shares   4,708,784 8,689
Treasury stock acquired, Values   70,092 255
2012 Program
      
Schedule of Treasury Stock [Line Items]      
Treasury stock acquired, Shares 2,567,266 5,863,451  
Treasury stock acquired, Values 51,107 98,892  
2013 Program
      
Schedule of Treasury Stock [Line Items]      
Treasury stock acquired, Shares 602,564    
Treasury stock acquired, Values 12,517    
2005 Long Term Incentive Plan
      
Schedule of Treasury Stock [Line Items]      
Treasury stock acquired, Shares 951,489 86,932 135,068
Treasury stock acquired, Values $ 22,213 $ 1,308 $ 4,059