Fair Value Measurements - Impaired Assets, Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Investments in single-family residential properties, net held for use and held for sale impairment adjustments
Total impairments	$ (1,671)	$ (95)	$ (2,274)	$ (1,132)
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	9,183	885	12,408	8,127
Total impairments	(1,495)	(95)	(2,098)	(865)
Fair value	7,688	790	10,310	7,262
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	764	0	764	496
Total impairments	(176)	0	(176)	(267)
Fair value	$ 588	$ 0	$ 588	$ 229