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Treasury Stock Acquisition (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of Treasury Stock [Line Items]      
Treasury shares at beginning of period 53,701,096 43,802,611 43,392,617
Other 31,013    
Treasury shares at end of period 77,336,387 53,701,096 43,802,611
Treasury shares at beginning of period $ 1,080,448 $ 918,711 $ 911,094
Treasury stock acquired, cost 264,686 161,737 7,617
Other 372    
Treasury shares at end of period $ 1,345,134 $ 1,080,448 $ 918,711
Stock Buyback Program      
Schedule of Treasury Stock [Line Items]      
Treasury stock acquired, shares 22,566,331 9,331,131 5,503
Treasury stock acquired, cost $ 250,109 $ 150,497 $ 109
Long Term Incentive Plan      
Schedule of Treasury Stock [Line Items]      
Treasury stock acquired, shares 1,037,947 567,354 404,491
Treasury stock acquired, cost $ 14,205 $ 11,240 $ 7,508