The ratio applied to the exchange of class B common stock in the Reorganization Transactions.

No definition available.

Name:	ladr_CommonStockExchangeRatio
Namespace Prefix:	ladr_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of shares of common stock issued to certain directors, officers and employees.

+ References

No definition available.

+ Details

Name:	ladr_CommonStockNumberOfSharesIssuedToDirectorsOfficersAndEmployees
Namespace Prefix:	ladr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of shares of common stock issued to the Exchanging Existing Owners.

+ References

No definition available.

+ Details

Name:	ladr_CommonStockNumberOfSharesIssuedToExchangingExistingOwners
Namespace Prefix:	ladr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of shares of common stock issued to the investors.

+ References

No definition available.

+ Details

Name:	ladr_CommonStockNumberOfSharesIssuedToInvestors
Namespace Prefix:	ladr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of shares of common stock issued as a result of the exercise of the underwriter's over-allotment option.

+ References

No definition available.

+ Details

Name:	ladr_CommonStockNumberOfSharesIssuedUnderwritersOverAllotmentOption
Namespace Prefix:	ladr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of classes of membership interests prior to the Reorganization Transactions.

+ References

No definition available.

+ Details

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

- Definition

Represents the number of limited partnership unit issued for each share to the Exchanging Existing Owners.

+ References

No definition available.

+ Details

Name:	ladr_NumberOfLimitedPartnershipUnitForEachShareIssuedToExchangingExistingOwners
Namespace Prefix:	ladr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of units held by the Continuing the Company Limited Partners.

+ References

No definition available.

+ Details

Name:	ladr_NumberOfUnitsHeldByContinuingTheCompanyLimitedPartners
Namespace Prefix:	ladr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of units held by the general partner.

+ References

No definition available.

+ Details

Name:	ladr_NumberOfUnitsHeldByGeneralPartner
Namespace Prefix:	ladr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.

+ Details

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

- Definition

Represents the percentage of cash saving in income tax benefits available for the reporting entity under the tax receivable agreement.

+ References

No definition available.

+ Details

Name:	ladr_PercentageOfApplicableCashSavingInIncomeTaxAvailableForEntity
Namespace Prefix:	ladr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of cash saving in income tax benefits distributable to unitholders of predecessor that choose to exchange their interests in predecessor and Class B shares of the reporting entity into Class A shares of the reporting entity under the tax receivable agreement.

+ References

No definition available.

+ Details

Name:	ladr_PercentageOfApplicableCashSavingInIncomeTaxDistributableToSpecifiedUnitholders
Namespace Prefix:	ladr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Real Estate Investment Trust, Ownership Restriction, Percentage of Outstanding Capital Stock

+ References

No definition available.

+ Details

Name:	ladr_RealEstateInvestmentTrustOwnershipRestrictionPercentageofOutstandingCapitalStock
Namespace Prefix:	ladr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the shares received by Exchanging Existing Owners in lieu of limited partnership units and shares.

+ References

No definition available.

+ Details

Name:	ladr_SharesOfCommonStockReceivedByExchangingExistingOwnersInLieuOfUnitsAndShares
Namespace Prefix:	ladr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

+ Details

Name:	us-gaap_CommonStockSharesOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

+ Details

Name:	us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of units or percentage investment held by one or more members or limited partners of the LLC or LP.

+ References

+ Details

Name:	us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of limited partner units outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

+ Details

Name:	us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow associated with the amount received from entity's first offering of stock to the public.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	dei_LegalEntityAxis=ladr_LadderCapitalFinanceHoldingsLLLPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_PartnerTypeOfPartnersCapitalAccountAxis=ladr_LadderCapitalFinanceHoldingsLLLPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

ORGANIZATION AND OPERATIONS (Details) $ / shares in Units, $ in Millions			11 Months Ended
	Feb. 27, 2015	Feb. 11, 2014 USD ($) shares	Dec. 31, 2014	Mar. 31, 2017 shares	Dec. 31, 2016 shares	Feb. 10, 2014 Class_of_Stock $ / shares
ORGANIZATION AND OPERATIONS
Number of classes of membership interests prior to the Reorganization Transactions \| Class_of_Stock						3
Share price used in the conversion of the three classes of membership (in dollars per share) \| $ / shares						$ 17.00
Ownership restriction, maximum percentage of outstanding capital stock	9.80%
Percentage of applicable cash saving in income tax distributable to specified unitholders	85.00%		85.00%
Percentage of applicable cash saving in income tax available for the entity	15.00%		15.00%
Class A common stock
ORGANIZATION AND OPERATIONS
Shares issued to the investors		15,237,500
Shares sold as a result of the exercise of the underwriter's over-allotment option		1,987,500
Net proceeds after deducting fees and expenses associated with the IPO \| $		$ 238.5
Shares issued to certain directors, officers and employees		1,687,513
Shares outstanding		50,597,205		79,086,784	71,586,170
Shares issued to the exchanging existing owners		33,672,192
Class B common stock
ORGANIZATION AND OPERATIONS
Shares outstanding		48,537,414		31,644,537	38,002,344
LCFH
ORGANIZATION AND OPERATIONS
Percentage of investment of operating partner		51.00%
Units outstanding		99,134,619
Units held by company		50,597,205
Units held by continuing the company limited partners		48,537,414
LCFH \| Class A common stock
ORGANIZATION AND OPERATIONS
Shares received by exchanging existing owners in lieu of any or all LP Units and shares of Class B common stock		33,672,192
Number of LP unit for each share issued to the exchanging existing owners		1
Stock exchange ratio		1
Series REIT
ORGANIZATION AND OPERATIONS
Percentage of investment of operating partner		51.90%
Limited partners ownership interest (in percent)		48.10%
Series REIT \| LCFH
ORGANIZATION AND OPERATIONS
Ownership interest in subsidiaries (in percent)		100.00%
Series TRS \| LCFH
ORGANIZATION AND OPERATIONS
Ownership interest in subsidiaries (in percent)		100.00%
LCFH \| LCFH
ORGANIZATION AND OPERATIONS
Ownership interest in LCFH				71.40%