Fair Value Measurements - Impaired Assets, Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Investments in single-family residential properties, net held for use and held for sale impairment adjustments
Total impairments	$ (1,296)	$ (424)	$ (3,570)	$ (1,556)
Fair Value, Measurements, Nonrecurring | Level 3 | Rental Properties
Investments in single-family residential properties, net held for use and held for sale impairment adjustments
Pre-impairment amount	7,318	988	19,726	9,115
Total impairments	(1,110)	(64)	(3,208)	(929)
Fair value	6,208	924	16,518	8,186
Fair Value, Measurements, Nonrecurring | Level 3 | Rental Properties
Investments in single-family residential properties, net held for use and held for sale impairment adjustments
Pre-impairment amount	894	1,827	1,658	2,323
Total impairments	(186)	(360)	(362)	(627)
Fair value	$ 708	$ 1,467	$ 1,296	$ 1,696