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Net Capital Requirements (Details) (USD $)
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Net Capital Requirements [Line Items] |
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| Stockholder's equity |
$ 336,471,000us-gaap_StockholdersEquity
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$ 193,413,000us-gaap_StockholdersEquity
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$ 51,221,000us-gaap_StockholdersEquity
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$ 63,443,000us-gaap_StockholdersEquity
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| Securities America |
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| Net Capital Requirements [Line Items] |
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| Regulatory net capital |
5,396,000us-gaap_NetCapital
/ dei_LegalEntityAxis
= lts_SecuritiesAmericaFinancialCorporationMember
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| Securities America | Minimum |
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| Net Capital Requirements [Line Items] |
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| Alternative minimum net capital requirement |
250,000us-gaap_AlternativeNetCapitalRequirement1
/ dei_LegalEntityAxis
= lts_SecuritiesAmericaFinancialCorporationMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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| Ladenburg |
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| Net Capital Requirements [Line Items] |
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| Regulatory net capital |
20,506,000us-gaap_NetCapital
/ dei_LegalEntityAxis
= lts_LadenburgThalmannAndCoIncMember
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| Ladenburg | Minimum |
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| Net Capital Requirements [Line Items] |
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| Alternative minimum net capital requirement |
253,000us-gaap_AlternativeNetCapitalRequirement1
/ dei_LegalEntityAxis
= lts_LadenburgThalmannAndCoIncMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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| Triad |
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| Net Capital Requirements [Line Items] |
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| Regulatory net capital |
6,025,000us-gaap_NetCapital
/ dei_LegalEntityAxis
= lts_TriadAdvisorsIncMember
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| Investacorp Inc |
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| Net Capital Requirements [Line Items] |
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| Regulatory net capital |
5,176,000us-gaap_NetCapital
/ dei_LegalEntityAxis
= lts_InvestacorpIncMember
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| KMS |
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| Net Capital Requirements [Line Items] |
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| Regulatory net capital |
3,075,000us-gaap_NetCapital
/ dei_LegalEntityAxis
= lts_KMSFinancialServicesInc.KMSMember
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| Alternative excess amount over net capital requirement |
2,516,000us-gaap_AlternativeExcessNetCapital
/ dei_LegalEntityAxis
= lts_KMSFinancialServicesInc.KMSMember
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| Indebtedness to net capital |
2.7us-gaap_RatioOfIndebtednessToNetCapital1
/ dei_LegalEntityAxis
= lts_KMSFinancialServicesInc.KMSMember
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| KMS | Minimum |
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| Net Capital Requirements [Line Items] |
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| Alternative minimum net capital requirement |
559,000us-gaap_AlternativeNetCapitalRequirement1
/ dei_LegalEntityAxis
= lts_KMSFinancialServicesInc.KMSMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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| Premier [Member] | Regulatory Requirements [Member] |
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| Net Capital Requirements [Line Items] |
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| Stockholder's equity |
1,366,000us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= lts_PremierTrustIncMember
/ lts_RegulatoryAssetAndLiabilityAxis
= lts_RegulatoryRequirementsMember
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| Premier [Member] | Regulatory Requirements [Member] | Cash [Member] |
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| Net Capital Requirements [Line Items] |
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| Minimum net capital requirement |
250,000us-gaap_MinimumNetCapitalRequired1
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CashMember
/ dei_LegalEntityAxis
= lts_PremierTrustIncMember
/ lts_RegulatoryAssetAndLiabilityAxis
= lts_RegulatoryRequirementsMember
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| Premier [Member] | Minimum | Regulatory Requirements [Member] |
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| Net Capital Requirements [Line Items] |
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| Stockholder's equity |
1,000,000us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= lts_PremierTrustIncMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ lts_RegulatoryAssetAndLiabilityAxis
= lts_RegulatoryRequirementsMember
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| Premier [Member] | Minimum | Regulatory Requirements [Member] | Cash [Member] |
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| Net Capital Requirements [Line Items] |
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| Stockholder's equity |
$ 250,000us-gaap_StockholdersEquity
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CashMember
/ dei_LegalEntityAxis
= lts_PremierTrustIncMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ lts_RegulatoryAssetAndLiabilityAxis
= lts_RegulatoryRequirementsMember
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