Stock-Based Compensation - Summary of Grants of Performance Based Restricted Stock Units Associated with executive officers and Key Employees (Parenthetical) (Detail) - Performance Based Restricted Stock Units [Member] - Senior Executives [Member] - $ / shares	Jul. 18, 2019	Aug. 02, 2018	Jul. 13, 2017
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%	0.98%
Fair value adjustment to closing price of common stock, per share	$ 0.55	$ (5.84)	$ (0.65)
Closing price of common stock	$ 18.49	$ 24.35	$ 32.50