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Treasury Stock Acquisition (Detail)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
USD ($)
shares
Schedule of Treasury Stock [Line Items]  
Treasury shares at beginning of period | shares 43,392,617
Treasury shares at end of period | shares 43,775,971
Treasury shares at beginning of period $ 911,094
Treasury stock acquired, cost 7,032
Treasury shares at end of period $ 918,126
Stock Buyback Program  
Schedule of Treasury Stock [Line Items]  
Treasury stock acquired, shares | shares 5,503
Treasury stock acquired, cost $ 109
Long Term Incentive Plan  
Schedule of Treasury Stock [Line Items]  
Treasury stock acquired, shares | shares 377,851
Treasury stock acquired, cost $ 6,923