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Treasury Stock Acquisition (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 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 43,400,606
Treasury shares at beginning of period $ 911,094
Treasury stock acquired, cost 223
Treasury shares at end of period $ 911,317
Long Term Incentive Plan  
Schedule of Treasury Stock [Line Items]  
Treasury stock acquired, shares | shares 7,989
Treasury stock acquired, cost $ 223