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Real Estate Securities - Components of Carrying Value (Which Equals Fair Value) of Residential Available for Sale Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | $ 610,270 | $ 829,245
Senior Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 73,324 | 279,251
Senior Securities | Prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 65,195 | 210,993
Senior Securities | Non-prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 8,129 | 68,258
Re-REMIC |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 165,707 | 165,064
Subordinate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 371,239 | 384,930
Residential |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 743,745 | 973,227
Credit reserve | (44,943) | (48,869)
Unamortized discount, net | (207,574) | (237,107)
Amortized cost | 491,228 | 687,251
Gross unrealized gains | 123,310 | 147,001
Gross unrealized losses | (4,268) | (5,007)
Carrying Value | 610,270 | 829,245
Residential | Senior Securities | Prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 70,717 | 217,605
Credit reserve | (987) | (1,305)
Unamortized discount, net | (6,614) | (22,079)
Amortized cost | 63,116 | 194,221
Gross unrealized gains | 4,503 | 20,263
Gross unrealized losses | (2,423) | (3,491)
Carrying Value | 65,196 | 210,993
Residential | Senior Securities | Non-prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 10,137 | 75,591
Credit reserve | (622) | (5,101)
Unamortized discount, net | (1,813) | (8,395)
Amortized cost | 7,702 | 62,095
Gross unrealized gains | 426 | 6,249
Gross unrealized losses | 0 | (86)
Carrying Value | 8,128 | 68,258
Residential | Re-REMIC |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 188,404 | 189,782
Credit reserve | (9,352) | (10,332)
Unamortized discount, net | (64,484) | (71,670)
Amortized cost | 114,568 | 107,780
Gross unrealized gains | 51,139 | 57,284
Gross unrealized losses | 0 | 0
Carrying Value | 165,707 | 165,064
Residential | Subordinate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 474,487 | 490,249
Credit reserve | (33,982) | (32,131)
Unamortized discount, net | (134,663) | (134,963)
Amortized cost | 305,842 | 323,155
Gross unrealized gains | 67,242 | 63,205
Gross unrealized losses | (1,845) | (1,430)
Carrying Value | $ 371,239 | $ 384,930

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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