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Fair Value of Financial Instruments - Market Valuation Adjustments, Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights income (loss), net	$ (3,922)	$ (4,261)	$ 20,309
Total Market Valuation Adjustments, Net	(51,975)	(298)	97,701
Mortgage Banking And Investment Activities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(14,875)	20,783	85,706
Mortgage Banking And Investment Activities | Residential Loans at Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	3,712	51,312	(10,455)
Mortgage Banking And Investment Activities | Loan Purchase and Forward Sales Commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	50,234	13,891	(399)
Mortgage Banking And Investment Activities | Residential Loans Held for Investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(6,337)	(697)	0
Mortgage Banking And Investment Activities | Investments In Consolidated Variable Interest Entity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(1,192)	(894)	(612)
Mortgage Banking And Investment Activities | Commercial Loans at Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	10,265	20,788	8,694
Mortgage Banking And Investment Activities | Real estate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(17,279)	(24,197)	38,926
Mortgage Banking And Investment Activities | Impaired Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(246)	(565)	(1,833)
Mortgage Banking And Investment Activities | Risk management derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(52,146)	(38,959)	51,385
Mortgage Banking And Investment Activities | Guarantee Asset
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(1,504)	0	0
Mortgage Banking And Investment Activities | Other Financing Receivable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(382)	104	0
Mortgage Servicing Rights Income (Loss), Including Risk Management Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights income (loss), net	(37,100)	(21,081)	11,995
Mortgage Servicing Rights Income (Loss), Including Risk Management Derivatives | Risk management derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights income (loss), net	(12,708)	0	0
Mortgage Servicing Rights Income (Loss), Including Risk Management Derivatives | Mortgage Servicing Rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights income (loss), net	$ (24,392)	$ (21,081)	$ 11,995

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