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Shareholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands			12 Months Ended
	Aug. 06, 2021	Aug. 23, 2018	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 1999
Stockholders Equity Note [Line Items]
Preferred stock outstanding			0	0
Number of shares authorized to be repurchased						7,500,000
Treasury stock, shares repurchased			0	0	0
Cost of repurchased shares			$ 114,425	$ 114,425	$ 114,425
Remaining number of shares authorized to be repurchased			1,129,087
Common stock issued into escrow		23,230
Robert W. Baird & Co. Inc [Member] | ATM Program [Member]
Stockholders Equity Note [Line Items]
Maximum aggregate offering amount of stock	$ 300,000
Number of shares sold under ATM			0
Class B Common Stock
Stockholders Equity Note [Line Items]
Amount of votes common stock is entitled			ten
Treasury stock, shares repurchased			48,263	48,263	48,263
Common Stock
Stockholders Equity Note [Line Items]
Amount of votes common stock is entitled			one
Percentage of Board entitled to elect			25.00%
Treasury stock, shares repurchased			6,322,650	6,322,650	6,322,650

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Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights.

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Amount of decrease of par value, additional paid in capital (APIC) and retained earnings of common and preferred stock retired from treasury when treasury stock is accounted for under the cost method.

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