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Stockholders' Equity (Common Stock) - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Jul. 02, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Mar. 13, 2020	Dec. 31, 2018
Class of Stock [Line Items]
Stock repurchased and retired, total costs		$ 12		$ 1,338	$ 1,023
Dividends per common share	$ 0.40
Dividends, date of record	Aug. 21, 2020
Dividends. date of payable	Sep. 18, 2020
Share Repurchase Plan [Member]
Class of Stock [Line Items]
Common stock repurchase authorized amount						$ 20,000	$ 20,000
Common stock repurchased and retired, weighted average price, excluding fees and commissions		$ 43.76	$ 40.99	$ 39.93	$ 41.28
Stock repurchased and retired, total costs		$ 20	$ 7,185	$ 5,161	$ 15,191
Common stock repurchased and retired, weighted average price, including fees and commissions		$ 43.79	$ 41.02	$ 39.96	$ 41.31
Common Stock [Member]
Class of Stock [Line Items]
Repurchase and retirement of common stock, shares		225		29,698	24,849
Common Stock [Member] | Share Repurchase Plan [Member]
Class of Stock [Line Items]
Repurchase and retirement of common stock, shares		457	175,160	129,142	367,736

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