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Components of Carrying Value (Which Equals Fair Value) of Residential Available for Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | $ 1,286,235 | $ 1,558,306
Senior Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 545,036 | 855,692
Senior Securities | Prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 358,813 | 662,306
Senior Securities | Non-prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 186,223 | 193,386
Re-REMIC |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 176,117 | 176,376
Subordinate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 565,082 | 526,238
Subordinate Securities | Prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 564,932 | 526,095
Subordinate Securities | Non-prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 150 | 143
Residential |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 1,466,234 | 1,808,992
Credit reserve | (73,875) | (116,870)
Unamortized discount, net | (299,105) | (298,469)
Amortized cost | 1,093,254 | 1,393,653
Amortized cost | 1,093,254 | 1,393,653
Gross unrealized gains | 195,988 | 187,786
Gross unrealized losses | (3,007) | (23,133)
Carrying Value | 1,286,235 | 1,558,306
Residential | Senior Securities | Prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 362,902 | 670,051
Credit reserve | (4,082) | (10,144)
Unamortized discount, net | (41,314) | (44,133)
Amortized cost | 317,506 | 615,774
Amortized cost | 317,506 | 615,774
Gross unrealized gains | 42,113 | 47,980
Gross unrealized losses | (805) | (1,448)
Carrying Value | 358,814 | 662,306
Residential | Senior Securities | Non-prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 202,812 | 218,603
Credit reserve | (9,894) | (13,840)
Unamortized discount, net | (33,676) | (36,882)
Amortized cost | 159,242 | 167,881
Amortized cost | 159,242 | 167,881
Gross unrealized gains | 27,004 | 25,654
Gross unrealized losses | (24) | (149)
Carrying Value | 186,222 | 193,386
Residential | Re-REMIC |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 206,212 | 214,046
Credit reserve | (16,553) | (30,429)
Unamortized discount, net | (80,986) | (80,188)
Amortized cost | 108,673 | 103,429
Amortized cost | 108,673 | 103,429
Gross unrealized gains | 67,444 | 72,947
Carrying Value | 176,117 | 176,376
Residential | Subordinate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 694,308 | 706,292
Credit reserve | (43,346) | (62,457)
Unamortized discount, net | (143,129) | (137,266)
Amortized cost | 507,833 | 506,569
Amortized cost | 507,833 | 506,569
Gross unrealized gains | 59,427 | 41,205
Gross unrealized losses | (2,178) | (21,536)
Carrying Value | $ 565,082 | $ 526,238

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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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