Stockholders' Equity - Additional Information (Detail) - USD ($)		12 Months Ended
	Feb. 02, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Oct. 31, 2019
Schedule Of Stockholders Equity [Line Items]
Common stock held by subsidiaries, shares		12,046,140	7,728,387
Aggregate value of all shares repurchased		$ 406,149,000	$ 95,227,000	$ 494,687,000
Share repurchase remaining authorization		$ 193,851,000
Share repurchase authorization expiration date		Dec. 31, 2022
Preferred stock, shares authorized		15,000,000	15,000,000
Preferred stock, par value		$ 0.01	$ 0.01
Dividend declared per share of common stock		$ 1.88	$ 1.88	$ 2.35
Subsequent Event [Member]
Schedule Of Stockholders Equity [Line Items]
Dividend declare date	Feb. 02, 2022
Dividend declared per share of common stock	$ 0.47
Dividend payable date	Feb. 25, 2022
Dividend date of record	Feb. 14, 2022
Class A Common Stock [Member]
Schedule Of Stockholders Equity [Line Items]
Common stock held by subsidiaries, shares		12,046,140	7,728,387
Class A Common Stock [Member] | Lazard Group LLC [Member]
Schedule Of Stockholders Equity [Line Items]
Number of shares distributed to the parent					17,000,000
Common Stock [Member] | Subsequent Event [Member]
Schedule Of Stockholders Equity [Line Items]
Share repurchase remaining authorization	$ 431,000,000
Share repurchase authorization expiration date	Dec. 31, 2024
Share Repurchase Authorization	$ 300,000,000
Common Stock [Member] | Executive Officers [Member]
Schedule Of Stockholders Equity [Line Items]
Aggregate value of all shares repurchased		$ 19,800,000	$ 10,000,000	$ 14,600,000
Series A Preferred Stock [Member]
Schedule Of Stockholders Equity [Line Items]
Preferred stock, shares outstanding		0	0	0
Series B Preferred Stock [Member]
Schedule Of Stockholders Equity [Line Items]
Preferred stock, shares outstanding		0	0	0