REAL ESTATE AND RELATED LEASE INTANGIBLES, NET - (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Real Estate [Abstract]
Gross intangible assets	$ 139.5	$ 127.4
Accumulated amortization	32.7	19.9
Net intangible assets	106.8	107.5
Unamortized favorable/unfavorable lease intangibles	6.5	7.4
Adjustment against operating lease income for favorable/unfavorable leases	1.4	1.3	$ 1.0
Unbilled rent receivables	5.0	3.0
Unencumbered real estates	$ 47.8	$ 85.7

Represents the adjustment to rental revenue for favorable and unfavorable leases.

No definition available.

Name:	ladr_FavorableAndUnfavorableLeaseAdjustment
Namespace Prefix:	ladr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the amount of favorable or unfavorable lease intangibles as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	ladr_FavorableUnfavorableLeaseIntangibles
Namespace Prefix:	ladr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Real Estates, Unencumbered

+ References

No definition available.

+ Details

Name:	ladr_RealEstatesUnencumbered
Namespace Prefix:	ladr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the amount of unbilled rent receivables.

+ References

No definition available.

+ Details

Name:	ladr_UnbilledRentReceivables
Namespace Prefix:	ladr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

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

- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

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

- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

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

- References

No definition available.

+ Details

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