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Related Parties - Amounts Receivable from and Payable to Related Parties (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Related Party Transaction [Line Items]    
Amounts receivables from related parties $ 1,267us-gaap_DueFromRelatedParties $ 7,920us-gaap_DueFromRelatedParties
Amounts payables to related parties 21,894us-gaap_DueToRelatedPartiesCurrentAndNoncurrent 5,031us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
LMDC Holdings [Member]    
Related Party Transaction [Line Items]    
Amounts receivables from related parties 1,107us-gaap_DueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= laz_LmdcHoldingsMember		 7,794us-gaap_DueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= laz_LmdcHoldingsMember
Amounts payables to related parties 20,654us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= laz_LmdcHoldingsMember		 4,300us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= laz_LmdcHoldingsMember
Other [Member]    
Related Party Transaction [Line Items]    
Amounts receivables from related parties 160us-gaap_DueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= laz_OtherRelatedPartiesMember		 126us-gaap_DueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= laz_OtherRelatedPartiesMember
Amounts payables to related parties $ 1,240us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= laz_OtherRelatedPartiesMember		 $ 731us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= laz_OtherRelatedPartiesMember