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Shareholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Nov. 12, 2019
Class of Stock [Line Items]
Cash dividends received	$ 6,913	$ 7,011	$ 46,361	$ 25,361
Repurchase of common stock (in shares)						1,525,000
Shares repurchased as a percentage of total shares outstanding						500.00%
Repurchase of common stock	$ 242	$ 147	25,545	4,842
Market value of shares repurchased under equity compensation plans			$ 736	$ 4,842
Minimum
Class of Stock [Line Items]
Company's common stock in lieu of cash to exercise options to purchase shares (in shares)	619		12,058
Maximum
Class of Stock [Line Items]
Company's common stock in lieu of cash to exercise options to purchase shares (in shares)		0		15,242
2007 Stock Repurchase Plan
Class of Stock [Line Items]
Repurchase of common stock (in shares)					0
2019 Stock Repurchase Plan
Class of Stock [Line Items]
Repurchase of common stock (in shares)	0		813,862		0
Repurchase of common stock	$ 0		$ 24,809
Common Stock
Class of Stock [Line Items]
Repurchase of common stock (in shares)	8,439	3,820	838,408	123,734
Repurchase of common stock	$ 151	$ 68	$ 14,946	$ 2,206
Common Stock | Minimum
Class of Stock [Line Items]
Company's common stock in lieu of cash to exercise options to purchase shares (in shares)	7,820		12,488
Market value of shares repurchased under equity compensation plans	$ 242		$ 588
Common Stock | Maximum
Class of Stock [Line Items]
Company's common stock in lieu of cash to exercise options to purchase shares (in shares)		3,820		108,492
Market value of shares repurchased under equity compensation plans		$ 147		$ 4,842

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- Definition

Market value of shares tendered by employees in lieu of cash to pay for exercise of options and or related taxes.

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Dividends received on equity and other investments during the current period.

+ References

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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