Represents the maximum additional distribution percentage if return thresholds are met.

No definition available.

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

- Definition

Represents the amount of expenses reported by an equity method investment of the entity.

+ References

No definition available.

+ Details

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

- Definition

Represents the percentage of distribution of all excess cash flows and all disposition proceeds upon any sale entitled after consideration of preferred return and return of equity remaining in the property to operating partner under an equity method investment of the entity.

+ References

No definition available.

+ Details

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

- Definition

Percentage of preferred return used to determine distribution of excess cash flow under an equity method investment of the entity.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Represents the minimum average net equity partnership investment as a basis for management fee reduction.

+ References

No definition available.

+ Details

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

- Definition

The number of mortgage loans sold to a related party.

+ References

No definition available.

+ Details

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

- Definition

Number of Unconsolidated Joint Ventures

+ References

No definition available.

+ Details

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

- Definition

Represents the percentage of equity kicker received with right to convert upon capital event associated with loan origination.

+ References

No definition available.

+ Details

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

- Definition

Represents the percentage of gain (loss) on sale of loans deferred.

+ References

No definition available.

+ Details

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

- Definition

Reimbursement of Expenses, Percentage

+ References

No definition available.

+ Details

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

- Definition

This element represents the aggregate cost of investments accounted for under the equity method of accounting.

+ 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 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
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+ Details

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

- Definition

Amount of fees and commissions from financial services and banking activities and correspondent clearing. Includes fees from depositor accounts, credit cards, merchant discounts, and fiduciary and trust activities, guarantee fees, investment advisory, management, and administrative fees, transfer agent fees, and insurance commissions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

+ Details

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

- Definition

The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) 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
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

+ Details

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

- Definition

Amount of interest capitalized during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Allowance for Funds Used during Construction
-URI http://asc.fasb.org/extlink&oid=6504829

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

+ Details

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

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

- Definition

The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (c)
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-SubTopic 10
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-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3461-108585

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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

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Data Type:	xbrli:stringItemType
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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Details)	1 Months Ended	3 Months Ended	12 Months Ended
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Details)	Apr. 30, 2012	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) loan Joint_Venture	Dec. 31, 2014 USD ($) loan	Dec. 31, 2013 USD ($) loan	Aug. 07, 2015 USD ($)	Mar. 22, 2013	Apr. 15, 2011
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures			$ 33,797,000	$ 6,041,000
Number of unconsolidated joint ventures \| Joint_Venture			1
Management fee			$ 15,205,000	11,704,000	$ 7,922,000
Proceeds from sale of mortgage loans held for sale to related party			2,509,090,000	3,523,689,000	2,345,705,000
Expenses from investment			(15,849,000)	(16,864,000)	(10,554,000)
LCRIP I
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures			48,771	3,898,000
Minimum average net equity partnership investment as a basis for management fee reduction			100,000,000
Management fee			$ 77,400	$ 400,000	$ 800,000
Number of loans sold to a related party \| loan			0	0	1
Proceeds from sale of mortgage loans held for sale to related party			$ 17,200,000
Gain on sale of mortgage loans			$ 100,000
Gain on sale of loans deferred (as a percent)			10.00%
Maximum additional distribution percentage if return thresholds are met			25.00%
LCRIP I \| LP Units
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)			10.00%					10.00%
Percentage of costs related to assets the Company is obligated to provide			10.00%
Grace Lake JV, LLC
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures			$ 2,891,000	$ 2,143,000
Percentage of equity kicker received with right to convert upon capital event	25.00%
Preferred return used to determine distribution of excess cash flow (as a percent)			8.25%
Percentage of distribution of all excess cash flows and all disposition proceeds upon any sale entitled after consideration of preferred return and return of equity remaining in the property to operating partner			25.00%
Percentage of investment of operating partner			75.00%
Grace Lake JV, LLC \| LP Units
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)							25.00%
Grace Lake JV, LLC \| Limited liability company
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)			25.00%
24 Second Avenue
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures			$ 30,857,000	$ 0
Ownership interest (as a percent)			73.80%
Amount contributed						$ 31,100,000
Expenses from investment		$ (600,000)
Interest costs capitalized		$ 300,000
24 Second Avenue \| Operating Partner
Schedule of Equity Method Investments [Line Items]
Ownership interest (as a percent)						26.20%