Fair Value - Reconciliation of Beginning and Ending Balances of Company's Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Net gains on sales of loans	$ 125,227,000	$ 104,034,000
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value Liabilities, Beginning Balance	(10,671,636,000)	(9,341,279,000)
Liabilities, Total Gains (Losses) Included in Net Income (Loss)	(102,548,000)	(196,973,000)
Liabilities, Purchases	0	0
Liabilities, Sales	0
Liabilities, Issuances	(457,448,000)	(445,046,000)
Liabilities, Settlements	228,456,000	148,044,000
Fair Value Liabilities, Ending Balance	(11,003,176,000)	(9,835,254,000)
Fair Value Assets, Beginning Balance	12,393,157,000	10,543,268,000
Fair Value Assets, Acquisition of EverBank Net Assets		58,680,000
Assets, Total Gains (Losses) Included in Comprehensive Income (Loss)	32,300,000	162,930,000
Assets, Purchases	267,088,000	512,723,000
Asset Sales	(16,592,000)
Assets, Issuances	261,811,000	182,076,000
Asset Settlements	(210,934,000)	(149,653,000)
Fair Value Assets, Ending Balance	12,726,830,000	11,310,024,000
Excess Servicing Spread [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value Liabilities, Beginning Balance	(66,311,000)
Liabilities, Total Gains (Losses) Included in Net Income (Loss)	(1,818,000)
Liabilities, Purchases	0
Liabilities, Sales	0
Liabilities, Issuances	0
Liabilities, Settlements	4,780,000
Fair Value Liabilities, Ending Balance	(63,349,000)
Mortgage-Backed Debt Related to Non-Residual Trusts [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value Liabilities, Beginning Balance	(653,167,000)	(684,778,000)
Liabilities, Total Gains (Losses) Included in Net Income (Loss)	(8,556,000)	(11,835,000)
Liabilities, Purchases	0	0
Liabilities, Sales	0
Liabilities, Issuances	0	0
Liabilities, Settlements	26,484,000	29,077,000
Fair Value Liabilities, Ending Balance	(635,239,000)	(667,536,000)
HMBS Related Obligations [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value Liabilities, Beginning Balance	(9,951,895,000)	(8,652,746,000)
Liabilities, Total Gains (Losses) Included in Net Income (Loss)	(92,233,000)	(188,173,000)
Liabilities, Purchases		0
Liabilities, Sales	0
Liabilities, Issuances	(457,448,000)	(445,046,000)
Liabilities, Settlements	197,192,000	118,967,000
Fair Value Liabilities, Ending Balance	(10,304,384,000)	(9,166,998,000)
Interest Rate Lock Commitments [Member] | Derivative Financial Instruments, Liabilities [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value Liabilities, Beginning Balance	(263,000)	(3,755,000)
Liabilities, Total Gains (Losses) Included in Net Income (Loss)	59,000	3,035,000
Liabilities, Purchases	0	0
Liabilities, Sales	0
Liabilities, Issuances	0	0
Liabilities, Settlements	0	0
Fair Value Liabilities, Ending Balance	(204,000)	(720,000)
Loans Receivable [Member] | Reverse Loans [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Loans Receivable Held For Sale Amount Sold	16,600,000
Net gains on sales of loans	(100,000)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value Assets, Beginning Balance	10,064,365,000	8,738,503,000
Assets, Total Gains (Losses) Included in Comprehensive Income (Loss)	122,909,000	205,409,000
Assets, Purchases	239,375,000	193,676,000
Asset Sales	(16,592,000)
Assets, Issuances	189,510,000	129,463,000
Asset Settlements	(169,674,000)	(117,472,000)
Fair Value Assets, Ending Balance	10,429,893,000	9,149,579,000
Loans Receivable [Member] | Forward Loans in Non-Residual Trusts [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value Assets, Beginning Balance	586,433,000	587,265,000
Assets, Total Gains (Losses) Included in Comprehensive Income (Loss)	8,164,000	10,783,000
Assets, Purchases	0	0
Asset Sales	0
Assets, Issuances	0	0
Asset Settlements	(26,685,000)	(28,951,000)
Fair Value Assets, Ending Balance	567,912,000	569,097,000
Loans Receivable [Member] | Charged Off Loans [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value Assets, Beginning Balance	57,217,000
Assets, Total Gains (Losses) Included in Comprehensive Income (Loss)	5,984,000
Assets, Purchases	0
Asset Sales	0
Assets, Issuances	0
Asset Settlements	(12,356,000)
Fair Value Assets, Ending Balance	50,845,000
Receivables Related to Non-Residual Trusts [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value Assets, Beginning Balance	25,201,000	43,545,000
Assets, Total Gains (Losses) Included in Comprehensive Income (Loss)	(246,000)	(987,000)
Assets, Purchases	0	0
Asset Sales	0
Assets, Issuances	0	0
Asset Settlements	(2,020,000)	(3,230,000)
Fair Value Assets, Ending Balance	22,935,000	39,328,000
Servicing Rights Carried at Fair Value [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value Assets, Beginning Balance	1,599,541,000	1,131,124,000
Fair Value Assets, Acquisition of EverBank Net Assets		58,680,000
Assets, Total Gains (Losses) Included in Comprehensive Income (Loss)	(129,235,000)	(47,634,000)
Assets, Purchases	27,713,000	319,047,000
Asset Sales	0
Assets, Issuances	72,301,000	52,613,000
Asset Settlements	0	0
Fair Value Assets, Ending Balance	1,570,320,000	1,513,830,000
Derivative Financial Instruments, Assets [Member] | Interest Rate Lock Commitments [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value Assets, Beginning Balance	60,400,000	42,831,000
Assets, Total Gains (Losses) Included in Comprehensive Income (Loss)	24,724,000	(4,641,000)
Assets, Purchases	0	0
Asset Sales	0
Assets, Issuances	0	0
Asset Settlements	(199,000)	0
Fair Value Assets, Ending Balance	$ 84,925,000	$ 38,190,000