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Long-Term Debt (Convertible Senior Notes) - Additional Information (Detail) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) $ / shares	Jun. 30, 2019 USD ($) $ / shares	Jun. 30, 2020 USD ($) $ / shares	Jun. 30, 2019 USD ($) $ / shares
Debt Instrument [Line Items]
Cash dividends on common stock \| $ / shares	$ 0.40	$ 0.40	$ 0.80	$ 0.80
Debt instrument loss from repurchase amount \| $	$ 150	$ 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			16.4039
Convertible debt, conversion price \| $ / shares	$ 60.96		$ 60.96
Debt Instrument, principal amount repurchased \| $	$ 4,550		$ 4,550
Debt instrument loss from repurchase amount \| $			$ 150
Debt discount, remaining amortization period			1 year 8 months 12 days
4.25% Convertible Senior Notes [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Cash dividends on common stock \| $ / shares			$ 0.35