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Other Investments - Additional Information (Details) - USD ($) $ in Thousands		1 Months Ended		2 Months Ended	3 Months Ended
	May 01, 2018	Jan. 31, 2019	May 31, 2018	Feb. 28, 2019	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Investment [Line Items]
Commitment to fund partnership					$ 66,000
Commitment to fund partnership, funded amount					19,000
Equity method investment earnings (losses)					3,000
Investment fair value changes, net					20,159	$ 1,609
Servicing asset, fair value					281,762			$ 286,778
Interest income					131,041	76,619
Other income, net					3,587	2,118
Light-Renovation Multifamily Loans
Investment [Line Items]
Commitment to fund partnership		$ 78,000
Commitment to fund partnership, funded amount					22,000
Equity method investments, carrying value					22,000
5 Arches, LLC
Investment [Line Items]
Payments to acquire equity method investment	$ 10,000		$ 10,000
Option to purchase additional equity, term	1 year		1 year
Option to purchase additional equity, amount							$ 40,000
Option to purchase additional equity, percent		80.00%
Gross income associated with investment				$ 300
Other income, net				$ 100
MSRs
Investment [Line Items]
Servicing asset, fair value					55,284	$ 66,496		60,281	$ 63,598
Servicing asset					4,860,000			4,930,000
Servicer advance financing
Investment [Line Items]
Collateral amounts					282,000
Investment fair value changes, net					1,000
Residential Loans
Investment [Line Items]
Servicing asset, unpaid principal balance on underlying loan					8,790,000
Servicing asset, fair value					303,920			300,468
Excess MSRs
Investment [Line Items]
Investment fair value changes, net					(400)
Servicing asset, fair value					28,992			$ 27,312
Interest income					$ 2,000
5 Arches, LLC
Investment [Line Items]
Minority interest, percentage			20.00%

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