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Loans, Held for Investment - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 3,151,386 | $ 2,693,092
Carrying Value, Percent of Portfolio | 100.00% | 100.00%
Hotel |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 694,045 | $ 408,428
Carrying Value, Percent of Portfolio | 22.00% | 15.20%
Residential - for sale |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 522,707 | $ 469,997
Carrying Value, Percent of Portfolio | 16.60% | 17.50%
Urban Retail Predevelopment |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 498,830 | $ 491,187
Carrying Value, Percent of Portfolio | 15.80% | 18.20%
Office |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 256,177 | $ 255,031
Carrying Value, Percent of Portfolio | 8.10% | 9.50%
Residential Rental |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 270,912 | $ 309,243
Carrying Value, Percent of Portfolio | 8.60% | 11.50%
Mixed Use |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 252,132 | $ 134,797
Carrying Value, Percent of Portfolio | 8.00% | 4.90%
Retail Center |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 240,296 | $ 209,401
Carrying Value, Percent of Portfolio | 7.60% | 7.80%
Healthcare |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 171,306 | $ 170,549
Carrying Value, Percent of Portfolio | 5.50% | 6.30%
Industrial |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 156,941 | $ 156,809
Carrying Value, Percent of Portfolio | 5.00% | 5.80%
Other |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 88,040 | $ 87,650
Carrying Value, Percent of Portfolio | 2.80% | 3.30%
New York City |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 1,232,256 | $ 1,034,303
Carrying Value, Percent of Portfolio | 39.10% | 38.40%
Midwest |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 505,769 | $ 405,992
Carrying Value, Percent of Portfolio | 16.00% | 15.10%
Southeast |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 490,354 | $ 332,276
Carrying Value, Percent of Portfolio | 15.60% | 12.30%
International (U.K.) |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 246,820 | $ 244,756
Carrying Value, Percent of Portfolio | 7.80% | 9.10%
West |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 197,068 | $ 219,664
Carrying Value, Percent of Portfolio | 6.30% | 8.20%
Mid Atlantic |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 261,076 | $ 263,717
Carrying Value, Percent of Portfolio | 8.30% | 9.80%
Southwest |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 79,636 | $ 54,614
Carrying Value, Percent of Portfolio | 2.50% | 2.00%
Northeast |  |
Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 138,407 | $ 137,770
Carrying Value, Percent of Portfolio | 4.40% | 5.10%

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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 + Details
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