Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION - Fair Value of Employee Stock Options Granted as Determined by Black-Scholes Valuation Model Assumptions (Detail)

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STOCK-BASED COMPENSATION - Fair Value of Employee Stock Options Granted as Determined by Black-Scholes Valuation Model Assumptions (Detail) - $ / shares
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Nonqualified Stock Options [Member]    
Stockholders Equity Note [Line Items]    
Risk-free interest rate 2.84% 2.15%
Expected volatility 16.72% 17.81%
Weighted-average fair value of options granted (usd per share) $ 15.23 $ 14.70
Expected dividend yield 2.93% 2.89%
Expected life (in years) 7 years 6 months 7 years 6 months
Long-Term Incentive Performance Award    
Stockholders Equity Note [Line Items]    
Risk-free interest rate 2.61% 1.46%
Expected volatility 16.51% 16.59%
Weighted-average fair value of options granted (usd per share) $ 137.53 $ 119.29
Expected dividend yield 123.46% 113.55%