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Loans, Held for Investment - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 3,278,334	$ 2,693,092
Percent of Portfolio	100.00%	100.00%
Hotel
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 702,447	$ 408,428
Percent of Portfolio	21.40%	15.20%
Residential - for sale
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 547,113	$ 469,997
Percent of Portfolio	16.70%	17.50%
Urban Retail Predevelopment
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 583,241	$ 491,187
Percent of Portfolio	17.80%	18.20%
Office
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 257,291	$ 255,031
Percent of Portfolio	7.80%	9.50%
Residential Rental
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 290,152	$ 309,243
Percent of Portfolio	8.90%	11.50%
Mixed Use
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 253,649	$ 134,797
Percent of Portfolio	7.70%	4.90%
Retail Center
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 240,902	$ 209,401
Percent of Portfolio	7.30%	7.80%
Healthcare
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 172,872	$ 170,549
Percent of Portfolio	5.30%	6.30%
Industrial
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 157,040	$ 156,809
Percent of Portfolio	4.80%	5.80%
Other
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 73,627	$ 87,650
Percent of Portfolio	2.30%	3.30%
New York City
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 1,255,668	$ 1,034,303
Percent of Portfolio	38.30%	38.40%
Midwest
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 498,767	$ 405,992
Percent of Portfolio	15.20%	15.10%
Southeast
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 596,664	$ 332,276
Percent of Portfolio	18.20%	12.30%
United Kingdom
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 252,881	$ 244,756
Percent of Portfolio	7.70%	9.10%
West
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 226,977	$ 219,664
Percent of Portfolio	6.90%	8.20%
Mid Atlantic
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 198,501	$ 263,717
Percent of Portfolio	6.10%	9.80%
Southwest
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 25,000	$ 54,614
Percent of Portfolio	0.80%	2.00%
Northeast
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 181,987	$ 137,770
Percent of Portfolio	5.50%	5.10%
Other International
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 41,889	$ 0
Percent of Portfolio	1.30%	0.00%

X

- Definition

Mortgage Loans on Real Estate, Commercial and Consumer, Percentage of Portfolio

+ References

No definition available.

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- Definition

The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(c))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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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.

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