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Treasury Stock Acquisition (Detail)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
USD ($)
shares
Schedule of Treasury Stock [Line Items]  
Treasury stock acquired, Shares, Beginning balance | shares 42,818,585
Treasury stock acquired, Shares, Ending balance | shares 43,207,240
Treasury stock acquired, Values, Beginning balance $ 899,035
Treasury stock acquired, Values 8,010
Treasury stock acquired, Values, Ending balance $ 907,045
2013 Program  
Schedule of Treasury Stock [Line Items]  
Treasury stock acquired, Shares | shares 8,618
Treasury stock acquired, Values $ 180
Long Term Incentive Plan  
Schedule of Treasury Stock [Line Items]  
Treasury stock acquired, Shares | shares 380,037
Treasury stock acquired, Values $ 7,830