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Residential Loans - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Contract	Sep. 30, 2013	Dec. 31, 2013 Contract
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 3,287,587,000		$ 3,287,587,000		$ 2,166,434,000
Residential Loans Held for Investment
Mortgage Loans on Real Estate [Line Items]
Carrying value	1,546,507,000		1,546,507,000		1,762,167,000
Principal value	1,554,876,000		1,554,876,000		1,770,803,000
Unamortized premium, net	13,540,000		13,540,000		16,791,000
Weighted average original loan-to-value (LTV)	66.00%		66.00%
Weighted average original Fair Isaac Corporation (FICO) score	733		733
Charge-offs, net	1,000,000	1,000,000	3,000,000	3,000,000
Principal value	6,000,000	3,000,000	14,000,000	10,000,000
Residential Loans Held for Investment | Residential Loans Acquired Prior To July 1st 2004
Mortgage Loans on Real Estate [Line Items]
Principal value	629,000,000		629,000,000		731,000,000
Unamortized premium, net	8,000,000		8,000,000		11,000,000
Percentage of loans prepaid			14.00%
Percentage of premiums amortized			23.00%
Residential Loans Held for Investment | Residential Loans Acquired After July 1st 2004
Mortgage Loans on Real Estate [Line Items]
Principal value	929,000,000		929,000,000		1,000,000,000
Unamortized premium, net	5,000,000		5,000,000		6,000,000
Percentage of loans prepaid			11.00%
Percentage of premiums amortized			13.00%
Residential Loans Held for Investment | First Mortgage
Mortgage Loans on Real Estate [Line Items]
Percentage of loan portfolio	99.00%		99.00%
Residential Loans Held for Investment | Second Mortgage
Mortgage Loans on Real Estate [Line Items]
Percentage of loan portfolio	1.00%		1.00%
Residential Loans
Mortgage Loans on Real Estate [Line Items]
Charge-offs, net	1,355,000	818,000	2,833,000	3,363,000
Loss confirmation period			23 months
Average recorded investment of loans individually evaluated for impairment	15,000,000	8,000,000	12,000,000	7,000,000
Interest income recognized on impaired loans	32,000	81,000	99,000	102,000
Residential Loans at Fair Value
Mortgage Loans on Real Estate [Line Items]
Carrying value	1,500,000,000		1,500,000,000		403,000,000
Number of loans			2,862		537
Principal value	1,460,000,000		1,460,000,000		399,000,000
Principal value	3,310,000,000		6,120,000,000
Positive Valuation adjustments	13,446,000	(10,804,000)	34,554,000	(17,339,000)
Residential Loans at Lower of Cost or Fair Value
Mortgage Loans on Real Estate [Line Items]
Carrying value	1,502,000		1,502,000		1,665,000
Number of loans			9		10
Principal value	2,000,000		2,000,000		2,000,000
Valuation adjustments	43,000		54,000
Residential Loans Held For Investment at Fair Value
Mortgage Loans on Real Estate [Line Items]
Carrying value	238,651,000		238,651,000
Principal balance of loans transferred	235,000,000
Fair value of loans transferred	241,000,000
Residential Loans Held For Sale
Mortgage Loans on Real Estate [Line Items]
Carrying value	1,502,429,000		1,502,429,000		404,267,000
Residential Loans Held For Sale | Mortgage Servicing Rights
Mortgage Loans on Real Estate [Line Items]
Carrying value	$ 1,610,000,000		$ 1,610,000,000

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The weighted average FICO score for borrowers at the time loans were originated.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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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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