Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data (Unaudited) (Narrative) (Detail)

v2.4.1.9
Quarterly Financial Data (Unaudited) (Narrative) (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended 3 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Schedule of Quarterly Financial Information [Line Items]                      
Expenses     $ 911,259us-gaap_OperatingExpenses $ 790,591us-gaap_OperatingExpenses $ 672,114us-gaap_OperatingExpenses            
Deferred income tax benefit from reversal of valuation allowance 5,575lts_DeferredIncomeTaxExpenseBenefitfromReversalofValuationAllowance 17,255lts_DeferredIncomeTaxExpenseBenefitfromReversalofValuationAllowance                  
Deferred income tax benefit from reversal of valuation allowance, per share $ 0.03lts_DeferredIncomeTaxExpenseBenefitfromReversalofValuationAllowanceperShare $ 0.08lts_DeferredIncomeTaxExpenseBenefitfromReversalofValuationAllowanceperShare                  
HCHC Holdings, Inc.                      
Schedule of Quarterly Financial Information [Line Items]                      
Preliminary allocations of purchase price 2,955us-gaap_BusinessAcquisitionsPurchasePriceAllocationYearOfAcquisitionNetEffectOnIncome
/ us-gaap_BusinessAcquisitionAxis
= lts_HCHCHoldingsInc.Member
                   
Non Cash Compensation                      
Schedule of Quarterly Financial Information [Line Items]                      
Expenses $ 2,852us-gaap_OperatingExpenses
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= lts_NonCashCompensationMember
$ 3,679us-gaap_OperatingExpenses
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= lts_NonCashCompensationMember
      $ 2,083us-gaap_OperatingExpenses
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= lts_NonCashCompensationMember
$ 1,927us-gaap_OperatingExpenses
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= lts_NonCashCompensationMember
$ 2,326us-gaap_OperatingExpenses
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= lts_NonCashCompensationMember
$ 1,647us-gaap_OperatingExpenses
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= lts_NonCashCompensationMember
$ 1,380us-gaap_OperatingExpenses
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= lts_NonCashCompensationMember
$ 1,413us-gaap_OperatingExpenses
/ us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis
= lts_NonCashCompensationMember