Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Pro Forma) (Details)

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Acquisitions (Pro Forma) (Details) (KMS Financial Services, Inc. and Securities Service Network, Inc. (SSN), USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
KMS Financial Services, Inc. and Securities Service Network, Inc. (SSN)
    
Business Acquisition [Line Items]    
Revenue   $ 275,408us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= lts_KMSFinancialServicesInc.andSecuritiesServiceNetworkInc.SSNMember
Net income   3,198us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax
/ us-gaap_BusinessAcquisitionAxis
= lts_KMSFinancialServicesInc.andSecuritiesServiceNetworkInc.SSNMember
Net loss available to common shareholders   $ (6)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= lts_KMSFinancialServicesInc.andSecuritiesServiceNetworkInc.SSNMember
Basic and diluted loss per share available to common shareholders   $ 0.00lts_BusinessAcquisitionProFormaEarningsPerShareBasicandDiluted
/ us-gaap_BusinessAcquisitionAxis
= lts_KMSFinancialServicesInc.andSecuritiesServiceNetworkInc.SSNMember
Weighted average common shares outstanding:    
Basic and diluted   185,483,752lts_ProFormaWeightedAverageSharesOutstandingBasicandDiluted
/ us-gaap_BusinessAcquisitionAxis
= lts_KMSFinancialServicesInc.andSecuritiesServiceNetworkInc.SSNMember 		[1]
Stock issued in acquisition, shares 3,981,684us-gaap_StockIssuedDuringPeriodSharesAcquisitions
/ us-gaap_BusinessAcquisitionAxis
= lts_KMSFinancialServicesInc.andSecuritiesServiceNetworkInc.SSNMember 		 
[1] Includes 3,981,684 shares issued in connection with the acquisitions.