Stock-Based Compensation - Summary of Grants of Performance-Based Restricted Stock Units Associated with Senior Executives and Key Employees (Parenthetical) (Detail) - Performance-Based Restricted Stock Units [Member] - Senior Executives [Member]	Jul. 18, 2019 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value adjustment to closing price of common stock, percentage	1.03%
Fair value adjustment to closing price of common stock, per share	$ 0.55
Closing price of common stock	$ 18.49