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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Fair Value	$ (61,551)	$ (46,401)
Notional Amount	6,112,412	6,483,976
Derivative Liabilities
Derivative [Line Items]
Fair Value	(119,161)	(62,794)
Notional Amount	2,696,153	3,083,315
Derivative Liabilities | Interest rate swaps
Derivative [Line Items]
Fair Value	(37,145)	(10,134)
Notional Amount	931,500	1,039,500
Derivative Liabilities | Interest rate swaps | Cash Flow Hedging
Derivative [Line Items]
Fair Value	(71,352)	(48,232)
Notional Amount	139,500	139,500
Derivative Liabilities | TBAs
Derivative [Line Items]
Fair Value	(10,151)	(2,519)
Notional Amount	1,435,000	1,450,500
Derivative Liabilities | Futures
Derivative [Line Items]
Fair Value	0	(445)
Notional Amount	0	78,000
Derivative Liabilities | Loan Purchase Commitments
Derivative [Line Items]
Fair Value	(513)	(1,464)
Notional Amount	190,153	375,815
Derivative Assets
Derivative [Line Items]
Fair Value	57,610	16,393
Notional Amount	3,416,259	3,400,661
Derivative Assets | Interest rate swaps
Derivative [Line Items]
Fair Value	24,177	2,590
Notional Amount	705,000	658,000
Derivative Assets | TBAs
Derivative [Line Items]
Fair Value	5,584	2,734
Notional Amount	1,075,000	1,028,500
Derivative Assets | Futures
Derivative [Line Items]
Fair Value	4,078	0
Notional Amount	140,000	0
Derivative Assets | Swaptions
Derivative [Line Items]
Fair Value	16,323	5,191
Notional Amount	520,000	925,000
Derivative Assets | Credit Default Index Swaps
Derivative [Line Items]
Fair Value	0	1,207
Notional Amount	0	25,000
Derivative Assets | Loan Purchase Commitments
Derivative [Line Items]
Fair Value	7,448	4,671
Notional Amount	$ 976,259	$ 764,161

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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X

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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