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Treasury Stock Acquisition (Detail)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
USD ($)
shares
Schedule of Treasury Stock [Line Items]  
Treasury shares at beginning of period | shares 43,207,240
Treasury shares at end of period | shares 43,376,292
Treasury shares at beginning of period $ 907,045
Treasury stock acquired, cost 3,611
Treasury shares at end of period $ 910,656
Stock Buyback Program  
Schedule of Treasury Stock [Line Items]  
Treasury stock acquired, shares | shares 8,488
Treasury stock acquired, cost $ 183
Long Term Incentive Plan  
Schedule of Treasury Stock [Line Items]  
Treasury stock acquired, shares | shares 160,564
Treasury stock acquired, cost $ 3,428