Annual report pursuant to Section 13 and 15(d)

Cover
- Document and Entity Information
Financial Statements
Notes to Financial Statements
Accounting Policies
- Summary of Significant Accounting Policies (Policies)
Notes Tables
Notes Details

Related Party Transactions - Additional Information (Details)

v2.4.1.9

Related Party Transactions - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2015	Mar. 31, 2013	Oct. 01, 2010 square_feet
Related Party Transaction [Line Items]
Operating lease, payments due	$ 25,920				$ 2,995
Operating leases, future minimum payments due, next twelve months	9,479				599
Operating leases, future minimum payments due, in two years	6,501
Operating leases, future minimum payments due, in three years	5,240
Operating leases, future minimum payments due, in four years	1,726
Operating leases, future minimum payments due, in five years	1,095
Leased area						18,150lts_LeasedArea
Rent expense	578us-gaap_LeaseAndRentalExpense	572us-gaap_LeaseAndRentalExpense	560us-gaap_LeaseAndRentalExpense
Lease Expiration	February 2018
Frost Real Estate Holdings [Member]
Related Party Transaction [Line Items]
Operating lease, payments due						1,574
Operating leases, future minimum payments due, next twelve months						315
Operating leases, future minimum payments due, in two years						315
Operating leases, future minimum payments due, in three years						315
Operating leases, future minimum payments due, in four years						315
Operating leases, future minimum payments due, in five years						315
Rent expense	351	320	293
Victor Executive [Member]
Related Party Transaction [Line Items]
Shareholding percentage		8.17%
Termination period	30 days
Annual fees	850	750	750
Victor Executive [Member] \| Scenario, Forecast [Member]
Related Party Transaction [Line Items]
Annual fees				$ 850

- Definition

Area under lease.

+ References

No definition available.

+ Details

Name:	lts_LeasedArea
Namespace Prefix:	lts_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Date which lease or group of leases is set to expire.

+ References

No definition available.

+ Details

Name:	lts_LeaseExpiration
Namespace Prefix:	lts_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Related Party, Termination Period

+ References

No definition available.

+ Details

Name:	lts_RelatedPartyTerminationPeriod
Namespace Prefix:	lts_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The annual fees payable pursuant to agreement between company and third party for providing services.

+ References

No definition available.

+ Details

Name:	lts_RelatedPartyTransactionsAnnualFees
Namespace Prefix:	lts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The percentage of shareholding by employess,officer,director and subsidiaries.

+ References

No definition available.

+ Details

Name:	lts_ShareholdingPercentage
Namespace Prefix:	lts_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717

+ Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of required minimum rental payments maturing in the next fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

+ Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of required minimum rental payments maturing in the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

+ Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of required minimum rental payments maturing in the forth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

+ Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of required minimum rental payments maturing in the third fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

+ Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of required minimum rental payments maturing in the second fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

+ Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=lts_FrostRealEstateHoldingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=lts_VictorExecutiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: