Stock-Based Compensation - Calculation of Fair Value of Each Employee Stock Purchase Grant Using the Black-Scholes Option-Pricing Model (Detail) - Employee Stock Purchase Plan [Member]	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019
Calculation of fair value of each employee stock purchase grant using the Black-Scholes option-pricing model
Dividend yield	4.10%	4.10%
Risk-free interest rate	0.10%	2.50%
Expected volatility	44.00%	34.00%
Expected life (in years)	6 months	6 months

No definition available.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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-Name Accounting Standards Codification
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