Annual report pursuant to Section 13 and 15(d)

Notes Payable (Schedule og Long-term Debt) (Details)

v2.4.1.9
Notes Payable (Schedule og Long-term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Note payable $ 56,034us-gaap_NotesPayable $ 64,648us-gaap_NotesPayable
Notes payable, unamortized discount 1,093us-gaap_DebtInstrumentUnamortizedDiscount 1,618us-gaap_DebtInstrumentUnamortizedDiscount
Notes payable to clearing firm under forgivable loan    
Debt Instrument [Line Items]    
Note payable 10,356us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= lts_GroupTwoMember
14,285us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= lts_GroupTwoMember
Note payable to a subsidiary of Premier Trust's former shareholder    
Debt Instrument [Line Items]    
Note payable 200us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= lts_GroupThreeMember
450us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= lts_GroupThreeMember
Notes payable to finance business acquisition    
Debt Instrument [Line Items]    
Note payable 29,201us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= lts_GroupFourMember
48,232us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= lts_GroupFourMember
Notes payable, unamortized discount 627us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= lts_GroupFourMember
1,618us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= lts_GroupFourMember
Note payable under term loan with bank    
Debt Instrument [Line Items]    
Note payable 1,406us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= lts_GroupFiveMember
1,681us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= lts_GroupFiveMember
Notes payable by subsidiary to certain former Highland shareholders    
Debt Instrument [Line Items]    
Note payable 6,737us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= lts_GroupSixMember
0us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= lts_GroupSixMember
Notes payable to KMS' former shareholders    
Debt Instrument [Line Items]    
Note payable 7,534us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= lts_GroupSevenMember
0us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= lts_GroupSevenMember
Notes payable, unamortized discount 466us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= lts_GroupSevenMember
 
Other [Member]    
Debt Instrument [Line Items]    
Note payable $ 600us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= us-gaap_OtherDebtSecuritiesMember
$ 0us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= us-gaap_OtherDebtSecuritiesMember