STOCK-BASED COMPENSATION - Fair Value of Employee Stock Options Granted as Determined by Black-Scholes Valuation Model Assumptions (Detail) - $ / shares |
12 Months Ended | ||
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Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| 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 |
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Weighted average expected volatility rate of share-based compensation awards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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