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Treasury Stock Acquisition (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Schedule of Treasury Stock [Line Items]                
Treasury shares at beginning of period     53,701,096       53,701,096  
Other             31,013  
Treasury shares at end of period 74,709,070           74,709,070  
Treasury shares at beginning of period     $ 1,080,448       $ 1,080,448  
Treasury stock acquired, cost $ 76,123 $ 88,258 $ 75,113 $ 51,776 $ 42,951 $ 16,928 239,494 $ 111,655
Other             371  
Treasury shares at end of period $ 1,319,942           $ 1,319,942  
Stock Buyback Program                
Schedule of Treasury Stock [Line Items]                
Treasury stock acquired, shares             19,961,344  
Treasury stock acquired, cost             $ 225,109  
Long Term Incentive Plan                
Schedule of Treasury Stock [Line Items]                
Treasury stock acquired, shares             1,015,617  
Treasury stock acquired, cost             $ 14,014