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Residential Loans - Additional Information (Detail) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2015 USD ($) loan	Sep. 30, 2015 USD ($) loan Contract	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) loan Contract
Mortgage Loans on Real Estate [Line Items]
Transfers from loans held-for-sale to loans held-for-investment		$ 964,013	$ 278,913
Transfers from loans held-for-investment to loans held-for-sale		66,918	$ 0
Principal balance of loans sold during period	$ 2,070,000	7,000,000
Carrying value of loans	$ 4,036,674	$ 4,036,674		$ 3,398,573
Percentage of fixed-rate loans	97.00%	97.00%
Sequoia
Mortgage Loans on Real Estate [Line Items]
Carrying value of loans	$ 1,170,246	$ 1,170,246		$ 1,474,386
Fixed-rate loans
Mortgage Loans on Real Estate [Line Items]
Weighted average coupon rate	4.10%	4.10%
Hybrid loans
Mortgage Loans on Real Estate [Line Items]
Weighted average coupon rate	3.41%	3.41%
Residential Loans
Mortgage Loans on Real Estate [Line Items]
Principal value of loans purchased	$ 2,910,000	$ 8,090,000
Residential Loans at Fair Value
Mortgage Loans on Real Estate [Line Items]
Number of loans | Contract		2,669		2,273
Loan Principal	1,460,000	$ 1,460,000		$ 1,300,000
Valuation adjustments	11,000	10,000
Loan pledged as collateral	1,300,000	$ 1,300,000
Residential Loans at Lower of Cost or Fair Value
Mortgage Loans on Real Estate [Line Items]
Number of loans | Contract		9		9
Loan Principal	2,000	$ 2,000		$ 2,000
Carrying value of loans	1,446	1,446		1,488
Residential Loans at Lower of Cost or Fair Value | Sequoia
Mortgage Loans on Real Estate [Line Items]
Carrying value of loans	0	$ 0		$ 0
Residential Loans Held For Investment at Fair Value
Mortgage Loans on Real Estate [Line Items]
Number of loans | Contract		1,808		803
Loan Principal	1,330,000	$ 1,330,000		$ 566,000
Valuation adjustments	$ 9,000	$ 5,000
Financing Receivable, Number Of Loans Past Due 90 Days Or More | loan	0	0		1
Transfers from loans held-for-sale to loans held-for-investment	$ 300,000	$ 962,000
Transfers from loans held-for-investment to loans held-for-sale	$ 67,000
Weighted average original Fair Isaac Corporation (FICO) score	772	772
Weighted average original loan-to-value (LTV)	64.00%	64.00%
Residential Loans Held For Investment at Fair Value | Sequoia
Mortgage Loans on Real Estate [Line Items]
Number of loans | Contract		4,815		5,315
Weighted average original Fair Isaac Corporation (FICO) score	732	732
Weighted average original loan-to-value (LTV)	66.00%	66.00%
Loans held-for-investment, delinquent greater than 90 days	$ 63,000	$ 63,000		$ 73,000
Loans held-for-investment, in foreclosure	32,000	32,000		39,000
Valuation adjustments	400	(5,000)
Residential Loans Held For Investment at Fair Value | FHLB Chicago
Mortgage Loans on Real Estate [Line Items]
Loan pledged as collateral	1,360,000	1,360,000
Residential Loans Held for Investment
Mortgage Loans on Real Estate [Line Items]
Loan Principal	1,275,609	1,275,609		1,483,213
Carrying value of loans	1,170,246	1,170,246		1,474,386
Unamortized premium, net	0	0		12,511
Allowance for loan losses	$ 0	0		$ 21,338
Mortgage servicing rights
Mortgage Loans on Real Estate [Line Items]
Principal balance of mortgage servicing rights purchased from third-party originators		$ 2,220,000

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The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of consumer loans, including, but not limited to, mortgage, home equity, vehicles, credit card, installment, and lease financing. Excludes loans and leases covered under loss sharing agreements.

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