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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 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | $ 829,245 | $ 1,267,624
Senior Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 279,251 | 487,557
Senior Securities | Prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 210,993 | 307,813
Senior Securities | Non-prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 68,258 | 179,744
Re-REMIC |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 165,064 | 168,347
Subordinate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 384,930 | 611,720
Subordinate Securities | Prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 220,141 | 448,838
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 | 973,227 | 1,445,079
Credit reserve | (48,869) | (70,067)
Unamortized discount, net | (237,107) | (296,342)
Amortized cost | 687,251 | 1,078,670
Amortized cost | 687,251 | 1,078,670
Gross unrealized gains | 147,001 | 191,750
Gross unrealized losses | (5,007) | (2,796)
Carrying Value | 829,245 | 1,267,624
Residential | Senior Securities | Prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 217,605 | 311,573
Credit reserve | (1,305) | (3,660)
Unamortized discount, net | (22,079) | (34,782)
Amortized cost | 194,221 | 273,131
Amortized cost | 194,221 | 273,131
Gross unrealized gains | 20,263 | 35,980
Gross unrealized losses | (3,491) | (1,298)
Carrying Value | 210,993 | 307,813
Residential | Senior Securities | Non-prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 75,591 | 196,258
Credit reserve | (5,101) | (9,644)
Unamortized discount, net | (8,395) | (31,491)
Amortized cost | 62,095 | 155,123
Amortized cost | 62,095 | 155,123
Gross unrealized gains | 6,249 | 24,682
Gross unrealized losses | (86) | (61)
Carrying Value | 68,258 | 179,744
Residential | Re-REMIC |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 189,782 | 195,098
Credit reserve | (10,332) | (15,202)
Unamortized discount, net | (71,670) | (79,611)
Amortized cost | 107,780 | 100,285
Amortized cost | 107,780 | 100,285
Gross unrealized gains | 57,284 | 68,062
Gross unrealized losses | 0 | 0
Carrying Value | 165,064 | 168,347
Residential | Subordinate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 490,249 | 742,150
Credit reserve | (32,131) | (41,561)
Unamortized discount, net | (134,963) | (150,458)
Amortized cost | 323,155 | 550,131
Amortized cost | 323,155 | 550,131
Gross unrealized gains | 63,205 | 63,026
Gross unrealized losses | (1,430) | (1,437)
Carrying Value | $ 384,930 | $ 611,720

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