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Outstanding Common Stock Equivalents That Were Anti-Dilutive Tickmarks (Detail) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]      
Anti-dilutive Non-Vested Stock Weighted Average Grant Date Fair Value $ 48.66 $ 38.40 $ 52.07