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Treasury Stock Acquisition (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Schedule of Treasury Stock [Line Items]  
Treasury stock acquired, Shares, Beginning balance 42,268,057
Treasury stock acquired, Shares, Ending balance 42,269,465
Treasury stock acquired, Values, Beginning balance $ 880,888
Treasury stock acquired, Values 43
Treasury stock acquired, Values, Ending balance 880,931
2005 Long Term Incentive Plan
  
Schedule of Treasury Stock [Line Items]  
Treasury stock acquired, Shares 1,408
Treasury stock acquired, Values $ 43