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] - $ / shares	Jul. 18, 2019	Aug. 02, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value adjustment to closing price of common stock, percentage	1.03%	0.76%
Fair value adjustment to closing price of common stock, per share	$ 0.55	$ (5.84)
Closing price of common stock	$ 18.49	$ 24.35