[Line Items] for Disposal Groups, Including Discontinued Operations [Table]

No definition available.

Name:	ladr_DisposalGroupsIncludingDiscontinuedOperationsLineItems
Namespace Prefix:	ladr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of real estate properties sold during the period.

+ References

No definition available.

+ Details

Name:	ladr_NumberOfRealEstatePropertiesSold
Namespace Prefix:	ladr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of units sold in real estate property owned during the period.

+ References

No definition available.

+ Details

Name:	ladr_NumberOfUnitsSoldInRealEstateProperty
Namespace Prefix:	ladr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of Units Remaining in Real Estate Property

+ References

No definition available.

+ Details

Name:	ladr_NumberofUnitsRemaininginRealEstateProperty
Namespace Prefix:	ladr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230

+ Details

Name:	us-gaap_GainLossOnDispositionOfAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

+ Details

Name:	us-gaap_GainLossOnSaleOfProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

+ Details

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

- Definition

Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(d))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_RealEstateInvestmentPropertyNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=ladr_DisposalProperties2017Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_MultifamilyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=ladr_LasVegasNevadaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=ladr_MiamiFloriaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=ladr_A2016DisposalPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=ladr_NetLeaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=ladr_RocklandMassachusettsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=ladr_CrawfordsvilleIndianaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

REAL ESTATE AND RELATED LEASE INTANGIBLES, NET - Real Estate Properties Sold (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) property	Sep. 30, 2016 USD ($) property	Sep. 30, 2017 USD ($) property	Sep. 30, 2016 USD ($) property	Dec. 31, 2016 USD ($)
Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of real estate			$ 20,522	$ 60,516
Real estate and related lease intangibles, net	$ 1,041,901		1,041,901		$ 822,338
Realized Gain/(Loss)	3,228	$ 4,649	7,790	15,616
2017 Disposal Properties
Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of real estate			20,672
Real estate and related lease intangibles, net	12,732		12,732
Realized Gain/(Loss)			7,940
Realized loss on sale			150
2017 Disposal Properties \| Condominium \| Las Vegas, NV
Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of real estate			14,568
Real estate and related lease intangibles, net	$ 7,943		7,943
Realized Gain/(Loss)			$ 6,625
Number of properties disposed \| property	0		0
Number of units sold (in properties) \| property			37
Number of units remaining (in properties) \| property			22
2017 Disposal Properties \| Condominium \| Miami, FL
Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of real estate			$ 6,104
Real estate and related lease intangibles, net	$ 4,789		4,789
Realized Gain/(Loss)			$ 1,315
Number of properties disposed \| property	0		0
Number of units sold (in properties) \| property			21
Number of units remaining (in properties) \| property			67
2016 Disposal Properties
Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of real estate				54,034
Real estate and related lease intangibles, net		38,418		38,418
Realized Gain/(Loss)				15,616
2016 Disposal Properties \| Net Lease \| Rockland, MA
Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of real estate				9,148
Real estate and related lease intangibles, net		$ 8,436		8,436
Realized Gain/(Loss)				$ 712
Number of properties disposed \| property		1		1
Number of units sold (in properties) \| property				0
Number of units remaining (in properties) \| property				0
2016 Disposal Properties \| Net Lease \| Crawfordsville, IN
Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of real estate				$ 6,190
Real estate and related lease intangibles, net		$ 5,723		5,723
Realized Gain/(Loss)				$ 467
Number of properties disposed \| property		1		1
Number of units sold (in properties) \| property				0
Number of units remaining (in properties) \| property				0
2016 Disposal Properties \| Condominium \| Las Vegas, NV
Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of real estate				$ 24,534
Real estate and related lease intangibles, net		$ 13,507		13,507
Realized Gain/(Loss)				$ 11,027
Number of properties disposed \| property		0		0
Number of units sold (in properties) \| property				58
Number of units remaining (in properties) \| property				74
2016 Disposal Properties \| Condominium \| Miami, FL
Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of real estate				$ 14,162
Real estate and related lease intangibles, net		$ 10,752		10,752
Realized Gain/(Loss)				$ 3,410
Number of properties disposed \| property		0		0
Number of units sold (in properties) \| property				49
Number of units remaining (in properties) \| property				104