Real estate assets, net (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($) property	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) property	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) property
Real Estate [Abstract]
Number of real estate properties held for use	5,414		5,414		4,933
Number of real estate properties rented	3,010		3,010		2,118
Number of real estate properties listed for rent	273		273		264
Number of real estate properties in various stages of renovation	694		694		350
Number of real estate properties under evaluation for rental portfolio	1,437		1,437		2,201
Impairment on real estate held for use | $	$ 2,000,000		$ 5,000,000	$ 0
Number of real estate properties held for sale	1,174		1,174		1,583
Real estate assets held for sale | $	$ 225,682,000		$ 225,682,000		$ 250,557,000
Impairment of on real estate held for sale | $	$ 3,900,000	$ 5,600,000	$ 15,800,000	$ 9,700,000