Quarterly report pursuant to Section 13 or 15(d)

Stock Incentive Plan - Schedule of Weighted-Average Assumptions Used to Estimate Fair Value of Stock Options and Restricted Stock Awards using Black-Scholes Option Valuation Model (Detail)

v3.19.2
Stock Incentive Plan - Schedule of Weighted-Average Assumptions Used to Estimate Fair Value of Stock Options and Restricted Stock Awards using Black-Scholes Option Valuation Model (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Expected volatility 41.82% 47.54% 41.84%
Expected dividends 8.00% 9.22% 7.89%
Expected term (in years) 7 years 4 months 24 days 7 years 6 months 7 years 4 months 24 days
Risk-free interest rate 2.95% 2.61% 2.93%