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Employee Benefit Plans (Shares Issued in Connection with Stock Compensation Awards) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]      
New shares issued from available authorized shares 0 0 0
Issued from available treasury stock 1,509,121 337,056 601,851
Total 1,509,121 337,056 601,851
Proceeds from stock option exercises $ 78,866 $ 14,853 $ 29,158
Intrinsic value of stock options exercised 30,935 5,766 13,714
Fair value of stock awards/units vested $ 3,679 $ 3,728 $ 4,346