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Stock-Based Compensation - Schedule of Grant Date Fair Value Black-Scholes Option-Pricing Model Assumptions (Detail)
6 Months Ended
Jun. 30, 2018
$ / shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Exercise price $ 65.80
Expected dividend yield 2.31%
Expected stock price volatility 25.28%
Risk-free interest rate 2.85%
Expected life (years) 6 years 6 months