Stockholders' Equity - Lazard Group Distributed Amounts to LAZ-MD Holdings and Subsidiaries of Lazard Ltd (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Schedule Of Group Distributions [Line Items]
Dividends distributed by Lazard Group	$ 35,917
Lazard Ltd [Member]
Schedule Of Group Distributions [Line Items]
Total distributed by Lazard Group	36,130
LAZ-MD Holdings [Member]
Schedule Of Group Distributions [Line Items]
Total distributed by Lazard Group	213
Subsidiaries of Lazard Ltd [Member]
Schedule Of Group Distributions [Line Items]
Dividends distributed by Lazard Group	$ 35,917