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Treasury Stock Acquisition (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Treasury Stock [Line Items]      
Treasury stock acquired, Shares, Beginning balance 42,818,585 42,268,057 38,146,738
Treasury stock acquired, Shares, Ending balance 43,207,240 42,818,585 42,268,057
Treasury stock acquired, Values, Beginning balance $ 899,035 $ 880,888 $ 795,051
Treasury stock acquired, Values 8,010 18,147 85,837
Treasury stock acquired, Values, Ending balance $ 907,045 $ 899,035 $ 880,888
2012 program      
Schedule of Treasury Stock [Line Items]      
Treasury stock acquired, Shares     2,567,266
Treasury stock acquired, Values     $ 51,107
2013 program      
Schedule of Treasury Stock [Line Items]      
Treasury stock acquired, Shares 8,618 13,898 602,564
Treasury stock acquired, Values $ 180 $ 466 $ 12,517
Long Term Incentive Plan      
Schedule of Treasury Stock [Line Items]      
Treasury stock acquired, Shares 380,037 536,630 951,489
Treasury stock acquired, Values $ 7,830 $ 17,681 $ 22,213