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Loans, Held for Investment - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 3,558,600	$ 2,693,092
Percent of Portfolio	100.00%	100.00%
Residential - for sale [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 735,551	$ 469,997
Percent of Portfolio	20.70%	17.50%
Hotel [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 652,745	$ 408,428
Percent of Portfolio	18.30%	15.20%
Urban Retail Predevelopment [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 644,283	$ 491,187
Percent of Portfolio	18.10%	18.20%
Mixed Use [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 352,094	$ 134,797
Percent of Portfolio	9.90%	5.00%
Office [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 293,093	$ 255,031
Percent of Portfolio	8.20%	9.50%
Residential Rental [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 278,117	$ 309,243
Percent of Portfolio	7.80%	11.50%
Retail Center [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 197,120	$ 209,401
Percent of Portfolio	5.50%	7.80%
Healthcare [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 174,244	$ 170,549
Percent of Portfolio	4.90%	6.30%
Other [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 154,017	$ 87,650
Percent of Portfolio	4.30%	3.30%
Industrial [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 77,336	$ 156,809
Percent of Portfolio	2.30%	5.70%
Manhattan, New York [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 1,246,235	$ 870,914
Percent of Portfolio	35.00%	32.30%
Brooklyn, New York [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 244,501	$ 163,389
Percent of Portfolio	6.90%	6.10%
Northeast [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 133,979	$ 137,770
Percent of Portfolio	3.80%	5.10%
Southeast [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 530,881	$ 332,276
Percent of Portfolio	14.90%	12.30%
Midwest [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 524,984	$ 405,992
Percent of Portfolio	14.70%	15.10%
Mid Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 248,786	$ 263,717
Percent of Portfolio	7.00%	9.80%
West [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 205,274	$ 219,664
Percent of Portfolio	5.80%	8.20%
Southwest [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 33,824	$ 54,614
Percent of Portfolio	1.00%	2.00%
United Kingdom [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 312,159	$ 244,756
Percent of Portfolio	8.70%	9.10%
Other International [Member]
Mortgage Loans on Real Estate [Line Items]
Carrying Value	$ 77,977	$ 0
Percent of Portfolio	2.20%	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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- 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.

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