Annual report pursuant to Section 13 and 15(d)

Notes Receivable from Financial Advisors (Detail)

v2.4.1.9
Notes Receivable from Financial Advisors (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for doubtful accounts 215us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 419us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Notes receivable 26,152us-gaap_NotesAndLoansReceivableGrossCurrent 31,751us-gaap_NotesAndLoansReceivableGrossCurrent
Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage bearing variable interest rate 8.00%us-gaap_ShortTermDebtPercentageBearingVariableInterestRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Loan amortized over forgiveness period 5 years  
Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan amortized over forgiveness period 3 years  
Securities America Financial Advisor [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable 20,000us-gaap_LoansReceivableNet
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lts_SecuritiesAmericaFinancialAdvisorMember