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Treasury Stock Acquisition (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Treasury Stock [Line Items]      
Treasury shares at beginning of period 43,802,611 43,392,617 43,207,240
Treasury shares at end of period 53,701,096 43,802,611 43,392,617
Treasury shares at beginning of period $ 918,711 $ 911,094 $ 907,045
Treasury stock acquired, cost 161,737 7,617 4,049
Treasury shares at end of period $ 1,080,448 $ 918,711 $ 911,094
Stock Buyback Program      
Schedule of Treasury Stock [Line Items]      
Treasury stock acquired, shares 9,331,131 5,503 8,488
Treasury stock acquired, cost $ 150,497 $ 109 $ 183
Long Term Incentive Plan      
Schedule of Treasury Stock [Line Items]      
Treasury stock acquired, shares 567,354 404,491 176,889
Treasury stock acquired, cost $ 11,240 $ 7,508 $ 3,866