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Treasury Stock Acquisition (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Treasury Stock [Line Items]      
Treasury shares at beginning of period 77,336,387 53,701,096 43,802,611
Other, shares   31,013  
Treasury shares at end of period 83,402,322 77,336,387 53,701,096
Treasury shares at beginning of period $ 1,345,134 $ 1,080,448 $ 918,711
Treasury stock acquired, cost 21,179 264,686 161,737
Other, cost   372  
Treasury shares at end of period $ 1,366,313 $ 1,345,134 $ 1,080,448
Stock Buyback Program      
Schedule of Treasury Stock [Line Items]      
Treasury stock acquired, shares 5,826,266 22,566,331 9,331,131
Treasury stock acquired, cost $ 20,000 $ 250,109 $ 150,497
Long Term Incentive Plan      
Schedule of Treasury Stock [Line Items]      
Treasury stock acquired, shares 239,669 1,037,947 567,354
Treasury stock acquired, cost $ 1,179 $ 14,205 $ 11,240