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Stock-Based Compensation - Summary of Grants of Performance Based Restricted Stock Units Associated with executive officers and Key Employees (Parenthetical) (Detail) - Senior Executives [Member] - $ / shares	Aug. 02, 2018	Jul. 13, 2017	Jul. 18, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Closing price of common stock	$ 24.35	$ 32.50	$ 18.49
Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value adjustment to closing price of common stock, percentage	0.76%	0.98%
Fair value adjustment to closing price of common stock, per share	$ 5.84	$ 0.65
Closing price of common stock	$ 24.35	$ 32.50	$ 18.49

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- Definition

The percentage adjustment to the closing price of common stock to reflect the fair market value per share of common stock determined using the Monte Carlo simulation model.

+ References

No definition available.

+ Details

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- Definition

The increase (decrease) to the closing price of common stock to reflect the fair market value per share of common stock determined using the Monte Carlo simulation model.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

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- Details

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