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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
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Carrying Value $ 1,671,786 $ 1,558,306
Senior Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Carrying Value 903,966 855,692
Senior Securities | Prime
    
Schedule of Available-for-sale Securities [Line Items]    
Carrying Value 711,710 662,306
Senior Securities | Non-prime
    
Schedule of Available-for-sale Securities [Line Items]    
Carrying Value 192,256 193,386
Re-REMIC
    
Schedule of Available-for-sale Securities [Line Items]    
Carrying Value 192,596 176,376
Subordinate Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Carrying Value 575,224 526,238
Subordinate Securities | Prime
    
Schedule of Available-for-sale Securities [Line Items]    
Carrying Value 575,067 526,095
Subordinate Securities | Non-prime
    
Schedule of Available-for-sale Securities [Line Items]    
Carrying Value 157 143
Residential
    
Schedule of Available-for-sale Securities [Line Items]    
Principal balance 1,861,814 1,808,992
Credit reserve (83,276) (116,870)
Unamortized discount, net (304,293) (298,469)
Amortized cost 1,474,245 1,393,653
Gross unrealized gains 204,710 187,786
Gross unrealized losses (7,169) (23,133)
Carrying Value 1,671,786 1,558,306
Residential | Senior Securities | Prime
    
Schedule of Available-for-sale Securities [Line Items]    
Principal balance 710,620 670,051
Credit reserve (5,476) (10,144)
Unamortized discount, net (37,763) (44,133)
Amortized cost 667,381 615,774
Gross unrealized gains 45,952 47,980
Gross unrealized losses (1,623) (1,448)
Carrying Value 711,710 662,306
Residential | Senior Securities | Non-prime
    
Schedule of Available-for-sale Securities [Line Items]    
Principal balance 209,967 218,603
Credit reserve (9,697) (13,840)
Unamortized discount, net (36,387) (36,882)
Amortized cost 163,883 167,881
Gross unrealized gains 28,385 25,654
Gross unrealized losses (12) (149)
Carrying Value 192,256 193,386
Residential | Re-REMIC
    
Schedule of Available-for-sale Securities [Line Items]    
Principal balance 223,389 214,046
Credit reserve (17,788) (30,429)
Unamortized discount, net (89,089) (80,188)
Amortized cost 116,512 103,429
Gross unrealized gains 76,084 72,947
Carrying Value 192,596 176,376
Residential | Subordinate Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Principal balance 717,838 706,292
Credit reserve (50,315) (62,457)
Unamortized discount, net (141,054) (137,266)
Amortized cost 526,469 506,569
Gross unrealized gains 54,289 41,205
Gross unrealized losses (5,534) (21,536)
Carrying Value $ 575,224 $ 526,238