Asset Management Expense Cap, Percentage

No definition available.

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

- Definition

Asset Management Fees, Percentage

+ References

No definition available.

+ Details

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

- Definition

Loans Receivable with Fixed Rates of Interest, Percentage

+ References

No definition available.

+ Details

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

- Definition

Loans and Leases Receivable, Related Parties, Mortgage Participation Purchased

+ References

No definition available.

+ Details

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

- Definition

Loans and Leases Receivable, Related Parties, Participating Mortgage Loan

+ References

No definition available.

+ Details

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

- Definition

Related Party Transaction, Related Party Purchases of Shares From Shareholders

+ References

No definition available.

+ Details

Name:	ladr_RelatedPartyTransactionRelatedPartyPurchasesofSharesFromShareholders
Namespace Prefix:	ladr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Area of land held.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfLand
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of interest income earned from interest-bearing assets owed to the entity by related party.

+ References

No definition available.

+ Details

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

- Definition

Cost of the investment.

+ References

No definition available.

+ Details

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

- Definition

For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(e))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

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

- Definition

Amount of cash inflow from related parties which reduce the amount of loans and leases receivable due from related parties.

+ References

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_CounterpartyNameAxis=ladr_HallettsInvestorsLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=ladr_MezzanineLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CounterpartyNameAxis=ladr_RelatedReserveIVLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=ladr_BParticipationInterestMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=ladr_AccruedExpensesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=us-gaap_GuarantorSubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_TitleOfIndividualAxis=us-gaap_ManagementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

RELATED PARTY TRANSACTIONS (Details)			3 Months Ended
RELATED PARTY TRANSACTIONS (Details)	Mar. 03, 2017 USD ($)	Jun. 03, 2016 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Mar. 13, 2017 USD ($)	Dec. 31, 2016	Oct. 18, 2016 USD ($)	May 20, 2015 USD ($) a
RELATED PARTY TRANSACTIONS
Percentage of loans receivable with fixed rates of interest			19.90%			10.30%
Halletts Investors LLC \| Mezzanine loan
RELATED PARTY TRANSACTIONS
Loans receivable from related party								$ 25,000,000.0
Percentage of loans receivable with fixed rates of interest								9.00%
Loans repaid at maturity by related party		$ 25.0
Interest income on loans				$ 600,000
Related Reserve IV LLC \| B Participation Interest \| Accrued Expenses
RELATED PARTY TRANSACTIONS
Interest income on loans				$ 35,944
Three Limited Liability Companies \| Halletts Investors LLC
RELATED PARTY TRANSACTIONS
Area of land \| a								9.66
Ladder Capital Asset Management LLC
RELATED PARTY TRANSACTIONS
Investment in Mutual Fund							$ 10,000,000.0
Fee earned on assets under management (as percentage)			0.75%
Fund's cap expense (as percentage)			0.95%
Ladder Capital Asset Management LLC \| Related Reserve IV LLC \| B Participation Interest
RELATED PARTY TRANSACTIONS
Percentage of loans receivable with fixed rates of interest					17.00%
Mortgage loan participation purchased by related party					$ 4,000,000.0
Participating mortgage loan amount					$ 136,500,000
Ladder Capital Asset Management LLC \| Senior Management
RELATED PARTY TRANSACTIONS
Investment in Mutual Fund			$ 1,600,000
Related \| Class A common stock
RELATED PARTY TRANSACTIONS
Value of shares transferred between shareholders	$ 80,000,000.0