Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Identifiable Intangible Assets) (Details)

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Acquisitions (Identifiable Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 0 Months Ended
Mar. 31, 2015
Jan. 02, 2015
Acquired Indefinite-lived Intangible Assets [Line Items]    
Useful Life 10 years 1 month 28 days  
Securities Service Network, Inc. (SSN)    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Identifiable intangible assets   $ 30,901us-gaap_IndefinitelivedIntangibleAssetsAcquired
/ us-gaap_BusinessAcquisitionAxis
= lts_SecuritiesServiceNetworkInc.SSNMember
Securities Service Network, Inc. (SSN) | Relationships with financial advisors    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Identifiable intangible assets   26,654us-gaap_IndefinitelivedIntangibleAssetsAcquired
/ us-gaap_BusinessAcquisitionAxis
= lts_SecuritiesServiceNetworkInc.SSNMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Useful Life   20 years
Securities Service Network, Inc. (SSN) | Developed technology    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Identifiable intangible assets   2,080us-gaap_IndefinitelivedIntangibleAssetsAcquired
/ us-gaap_BusinessAcquisitionAxis
= lts_SecuritiesServiceNetworkInc.SSNMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Useful Life   12 years 6 months
Securities Service Network, Inc. (SSN) | Trade names    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Identifiable intangible assets   1,756us-gaap_IndefinitelivedIntangibleAssetsAcquired
/ us-gaap_BusinessAcquisitionAxis
= lts_SecuritiesServiceNetworkInc.SSNMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Useful Life   9 years
Securities Service Network, Inc. (SSN) | Non-compete agreements    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Identifiable intangible assets   $ 411us-gaap_IndefinitelivedIntangibleAssetsAcquired
/ us-gaap_BusinessAcquisitionAxis
= lts_SecuritiesServiceNetworkInc.SSNMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Useful Life   3 years