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Agency MBS and Non-Agency MBS, Classified as Available-for-Sale which are Carried at Fair Value (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost   $ 4,844,932
Paydowns receivable $ 21,816 24,707 [1],[2]
Unrealized gains   61,405
Unrealized losses   (38,262)
Available-for-sale Securities, Total 4,355,790 4,892,782
Fair value 662,054 682,061
Agency Mortgage Backed Securities    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost 4,283,208 4,844,932
Paydowns receivable [1] 21,816 [3] 24,707 [2]
Unrealized gains 61,241 61,405
Unrealized losses (10,475) (38,262)
Available-for-sale Securities, Total 4,355,790 4,892,782
Agency Mortgage Backed Securities | Hybrids    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost 1,537,625 1,926,775
Paydowns receivable [1] 12,619 [3] 16,947 [2]
Unrealized gains 4,820 2,812
Unrealized losses (6,174) (25,347)
Available-for-sale Securities, Total 1,548,890 1,921,187
Agency Mortgage Backed Securities | 15-Year Fixed-Rate    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost 542,442 653,246
Paydowns receivable [1] 0 [3] 0 [2]
Unrealized gains 5,353 1,920
Unrealized losses (309) (8,208)
Available-for-sale Securities, Total 547,486 646,958
Agency Mortgage Backed Securities | 20-Year and 30-Year Fixed-Rate    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost 170,106 178,424
Paydowns receivable [1] 0 [3] 0 [2]
Unrealized gains 8,169 6,807
Unrealized losses 0 0
Available-for-sale Securities, Total 178,275 185,231
Agency Mortgage Backed Securities | Ginnie Mae    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost 9,798 10,118
Paydowns receivable [1] 0 [3] 0 [2]
Unrealized gains 2 3
Unrealized losses (140) (156)
Available-for-sale Securities, Total 9,660 9,965
Agency Mortgage Backed Securities | Freddie Mac    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost 1,711,943 1,976,155
Paydowns receivable [1] 21,816 [3] 24,707 [2]
Unrealized gains 16,000 12,922
Unrealized losses (5,878) (23,689)
Available-for-sale Securities, Total 1,743,881 1,990,095
Agency Mortgage Backed Securities | Fannie Mae    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost 2,561,467 2,858,659
Paydowns receivable [1] 0 [3] 0 [2]
Unrealized gains 45,239 48,480
Unrealized losses (4,457) (14,417)
Available-for-sale Securities, Total 2,602,249 2,892,722
Agency Mortgage Backed Securities | ARMs    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost 2,033,035 2,086,487
Paydowns receivable [1] 9,197 [3] 7,760 [2]
Unrealized gains 42,899 49,866
Unrealized losses (3,992) (4,707)
Available-for-sale Securities, Total 2,081,139 2,139,406
MBS    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost 4,965,304 5,524,516
Paydowns receivable [1] 21,816 [3] 24,819 [2]
Unrealized gains 65,291 69,300
Unrealized losses (34,567) (43,792)
Available-for-sale Securities, Total 5,017,844 5,574,843
Non-Agency MBS    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost 682,096 679,584
Paydowns receivable [1] 0 [3] 112 [2]
Unrealized gains 4,050 7,895
Unrealized losses (24,092) (5,530)
Fair value $ 662,054 $ 682,061
[1] Paydowns receivable on Agency MBS are generated when the Company receives notice from Freddie Mac of prepayments but does not receive the actual cash with respect to such prepayments until the 15th day of the following month.
[2] Paydowns receivable on Non-Agency MBS represents when the Company receives notice of prepayments but does not receive the actual cash until the following month.
[3] Paydowns receivable on Non-Agency MBS represent when the Company receives notice of prepayments but does not receive the actual cash until the following month.