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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 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | $ 698,356 | $ 829,245
Senior Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 140,616 | 279,251
Senior Securities | Prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 111,523 | 210,993
Senior Securities | Non-prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 29,093 | 68,258
Re-REMIC |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 162,970 | 165,064
Subordinate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 394,770 | 384,930
Subordinate Securities | Non-prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 1,000 | 1,000
Residential |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 845,732 | 973,227
Credit reserve | (48,547) | (48,869)
Unamortized discount, net | (219,630) | (237,107)
Amortized cost | 577,555 | 687,251
Gross unrealized gains | 127,014 | 147,001
Gross unrealized losses | (6,213) | (5,007)
Carrying Value | 698,356 | 829,245
Residential | Senior Securities | Prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 120,577 | 217,605
Credit reserve | (1,108) | (1,305)
Unamortized discount, net | (13,491) | (22,079)
Amortized cost | 105,978 | 194,221
Gross unrealized gains | 9,326 | 20,263
Gross unrealized losses | (3,781) | (3,491)
Carrying Value | 111,523 | 210,993
Residential | Senior Securities | Non-prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 31,781 | 75,591
Credit reserve | (687) | (5,101)
Unamortized discount, net | (3,262) | (8,395)
Amortized cost | 27,832 | 62,095
Gross unrealized gains | 1,482 | 6,249
Gross unrealized losses | (221) | (86)
Carrying Value | 29,093 | 68,258
Residential | Re-REMIC |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 189,146 | 189,782
Credit reserve | (11,258) | (10,332)
Unamortized discount, net | (66,586) | (71,670)
Amortized cost | 111,302 | 107,780
Gross unrealized gains | 51,668 | 57,284
Gross unrealized losses | 0 | 0
Carrying Value | 162,970 | 165,064
Residential | Subordinate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 504,228 | 490,249
Credit reserve | (35,494) | (32,131)
Unamortized discount, net | (136,291) | (134,963)
Amortized cost | 332,443 | 323,155
Gross unrealized gains | 64,538 | 63,205
Gross unrealized losses | (2,211) | (1,430)
Carrying Value | $ 394,770 | $ 384,930

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