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Employee Benefit Plans (Shares Issued in Connection with Stock Compensation Awards) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]      
New shares issued from available authorized shares 0 0 153,275
Issued from available treasury stock 337,056 601,851 1,179,551
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 337,056 601,851 1,332,826
Proceeds from stock option exercises $ 14,853 $ 29,158 $ 68,653
Intrinsic value of stock options exercised 5,766 13,714 20,506
Fair value of stock awards/units vested $ 3,728 $ 4,346 $ 1,918