Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Narrative) (Detail)

v2.4.1.9
Commitments and Contingencies (Narrative) (Detail) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 12 Months Ended 0 Months Ended 16 Months Ended 2 Months Ended 10 Months Ended
Jan. 31, 2014
Oct. 31, 2011
subsidiary
Apr. 30, 2013
Dec. 31, 2014
Oct. 17, 2014
employee
Sep. 30, 2014
employee
Jan. 31, 2015
Jan. 31, 2015
claim
employee
Dec. 31, 2013
Loss Contingencies [Line Items]                  
Deferred rent       $ 1,514us-gaap_DeferredRentCredit         $ 1,871us-gaap_DeferredRentCredit
Number of subsidiaries included in law suit   2lts_NumberofSubsidiariesIncludedinLawSuit              
Life insurance policy, suitability amount 15,000lts_LifeInsurancePolicySuitabilityAmount                
Accrued liabilities       359us-gaap_LossContingencyAccrualProductLiabilityNet         3,291us-gaap_LossContingencyAccrualProductLiabilityNet
Compensatory damages                  
Loss Contingencies [Line Items]                  
Loss contingency accrual                 1,325us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= lts_CompensatoryMember
Litigation settlement, amount       (1,325)us-gaap_LitigationSettlementAmount
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= lts_CompensatoryMember
         
Damages sought by plaintiff 3,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= lts_CompensatoryMember
  2,164us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= lts_CompensatoryMember
           
Compensatory damages | Securities America                  
Loss Contingencies [Line Items]                  
Damages sought by plaintiff         4,500us-gaap_LossContingencyDamagesSoughtValue
/ dei_LegalEntityAxis
= lts_SecuritiesAmericaFinancialCorporationMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= lts_CompensatoryMember
       
Number of plaintiffs         29us-gaap_LossContingencyNumberOfPlaintiffs
/ dei_LegalEntityAxis
= lts_SecuritiesAmericaFinancialCorporationMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= lts_CompensatoryMember
       
Compensatory damages | Securities America | Pending Litigation                  
Loss Contingencies [Line Items]                  
New claims filed         7us-gaap_LossContingencyNewClaimsFiledNumber
/ dei_LegalEntityAxis
= lts_SecuritiesAmericaFinancialCorporationMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= lts_CompensatoryMember
       
Number of plaintiffs         17us-gaap_LossContingencyNumberOfPlaintiffs
/ dei_LegalEntityAxis
= lts_SecuritiesAmericaFinancialCorporationMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= lts_CompensatoryMember
       
Compensatory damages | Triad                  
Loss Contingencies [Line Items]                  
New claims filed           7us-gaap_LossContingencyNewClaimsFiledNumber
/ dei_LegalEntityAxis
= lts_TriadAdvisorsIncMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= lts_CompensatoryMember
     
Damages sought by plaintiff           2,416us-gaap_LossContingencyDamagesSoughtValue
/ dei_LegalEntityAxis
= lts_TriadAdvisorsIncMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= lts_CompensatoryMember
     
Subsequent event | Convertible Notes Payable [Member]                  
Loss Contingencies [Line Items]                  
Offering             330,000lts_ProceedsfromIssuancePublicOffering
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Subsequent event | Common Stock                  
Loss Contingencies [Line Items]                  
Offering             $ 1,656,000lts_ProceedsfromIssuancePublicOffering
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Subsequent event | Compensatory damages                  
Loss Contingencies [Line Items]                  
New claims filed             2us-gaap_LossContingencyNewClaimsFiledNumber
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= lts_CompensatoryMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Number of plaintiffs             17us-gaap_LossContingencyNumberOfPlaintiffs
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= lts_CompensatoryMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Subsequent event | Compensatory damages | Securities America                  
Loss Contingencies [Line Items]                  
New claims filed               8us-gaap_LossContingencyNewClaimsFiledNumber
/ dei_LegalEntityAxis
= lts_SecuritiesAmericaFinancialCorporationMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= lts_CompensatoryMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Number of plaintiffs               46us-gaap_LossContingencyNumberOfPlaintiffs
/ dei_LegalEntityAxis
= lts_SecuritiesAmericaFinancialCorporationMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= lts_CompensatoryMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Subsequent event | Compensatory damages | Ladenburg                  
Loss Contingencies [Line Items]                  
Number of plaintiffs             1us-gaap_LossContingencyNumberOfPlaintiffs
/ dei_LegalEntityAxis
= lts_LadenburgThalmannAndCoIncMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= lts_CompensatoryMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember