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Long-Term Debt (Convertible Senior Notes) - Additional Information (Detail) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2019 USD ($) $ / shares	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2019 USD ($) $ / shares
Debt Instrument [Line Items]
Cash dividends on common stock | $ / shares	$ 0.40	$ 0.40		$ 1.20	$ 1.20
Debt instrument loss from repurchase amount | $	$ 0	$ 0		$ 150	$ 0
4.25% Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument stated interest rate	4.25%			4.25%
Convertible debt, conversion ratio				16.42
Convertible debt, conversion price | $ / shares	$ 60.91			$ 60.91
Debt Instrument, principal amount repurchased | $			$ 4,550
Debt instrument loss from repurchase amount | $			$ 150
Debt discount, remaining amortization period				1 year 4 months 24 days
4.25% Convertible Senior Notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Cash dividends on common stock | $ / shares				$ 0.35

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- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

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The price per share of the conversion feature embedded in the debt instrument.

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Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Face (par) amount of the original debt instrument that was repurchased.

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Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase.

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