Represents the length of period of the extension options.

No definition available.

Name:	ladr_DebtInstrumentLengthOfPeriodOfExtensionOptions
Namespace Prefix:	ladr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument Length of Additional Period of Extension Options

+ References

No definition available.

+ Details

Name:	ladr_DebtInstrumentLengthofAdditionalPeriodofExtensionOptions
Namespace Prefix:	ladr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of twelve-month extension maturity periods, subject to the satisfaction of customary conditions under the new revolving credit facility.

+ References

No definition available.

+ Details

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

- Definition

Line of Credit Facility, Number of Additional Extensions of Maturity Period

+ References

No definition available.

+ Details

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

- Definition

Represents the committed amount as of the balance sheet date of securities that an institution sells and agrees to repurchase (the identical or substantially the same securities) as a seller-borrower at a specified date for a specified price, also known as a repurchase agreement, or repo.

+ References

No definition available.

+ Details

Name:	ladr_SecuritiesSoldUnderAgreementsToRepurchaseCommittedAmount
Namespace Prefix:	ladr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Securities Sold under Agreements to Repurchase Committed Amount, Terminated

+ References

No definition available.

+ Details

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

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_SecuritiesFinancingTransactionAxis=ladr_TermMasterRepurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SecuritiesFinancingTransactionAxis=ladr_CommittedMasterRepurchaseAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=ladr_Maturingon1July2018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=ladr_Maturingon2August2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=ladr_Maturingon24October2016Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

SUBSEQUENT EVENTS (Details)			6 Months Ended	12 Months Ended
SUBSEQUENT EVENTS (Details)	Aug. 03, 2016 USD ($) Extension	Oct. 25, 2015 USD ($) Extension	Jun. 30, 2016 USD ($) Extension	Dec. 31, 2015 USD ($) Extension	Jul. 01, 2016 USD ($)
Committed Securities Repurchase Facility
Subsequent Event [Line Items]
Committed amount on master repurchase agreement			$ 300,000,000
Committed Loan repurchase facility
Subsequent Event [Line Items]
Committed amount on master repurchase agreement			1,585,000,000	$ 1,485,000,000
7/1/2018 \| Committed Securities Repurchase Facility \| Subsequent Event
Subsequent Event [Line Items]
Committed amount on master repurchase agreement					$ 400,000,000.0
8/2/2019 \| Committed Loan repurchase facility \| Subsequent Event
Subsequent Event [Line Items]
Committed amount on master repurchase agreement	$ 100,000,000.0
Number of extension maturity periods \| Extension	1
Length of extension options	12 months
Number of additional extension maturity periods \| Extension	2
Length of additional extension maturity periods	6 months
10/24/2016 \| Committed Loan repurchase facility
Subsequent Event [Line Items]
Committed amount on master repurchase agreement		$ 35,000,000	$ 35,000,000	$ 35,000,000
Number of extension maturity periods \| Extension		2	2	2
Length of extension options		6 months	6 months	6 months
10/24/2016 \| Committed Loan repurchase facility \| Subsequent Event
Subsequent Event [Line Items]
Committed amount or master repurchase facility terminated	$ 35,000,000