Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
STOCK-BASED COMPENSATION - Fair Value of Employee Stock Options Granted as Determined by Black-Scholes Valuation Model Assumptions (Detail) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Long Term Incentive Performance Award      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected dividend yield 113.55% 129.08% 65.86%
Risk-free interest rate 16.59% 16.46% 15.53%
Expected volatility 1.46% 1.00% 0.89%
Weighted-average fair value of options granted $ 119.29 $ 136.18 $ 63.64
Nonqualified Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected dividend yield 2.89% 2.95% 2.63%
Risk-free interest rate 2.15% 1.62% 2.07%
Expected life in years 7 years 6 months 7 years 6 months 7 years 6 months
Expected volatility 17.81% 22.40% 20.61%
Weighted-average fair value of options granted $ 14.70 $ 16.46 $ 18.07