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Single-family properties - Schedule of Single-Family Properties (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013 Property	Dec. 31, 2012 Property
Property Subject to or Available for Operating Lease [Line Items]
Number of properties	23,268	3,644
Net book value	$ 3,861,422	$ 505,713
Single-Family Properties Being Renovated [Member]
Property Subject to or Available for Operating Lease [Line Items]
Number of properties	2,744	1,857
Net book value	393,975	261,136
Leased Single-Family Properties [Member]
Property Subject to or Available for Operating Lease [Line Items]
Number of properties	17,328	1,164
Net book value	2,914,947	158,068
Vacant Single-Family Properties Available for Lease [Member]
Property Subject to or Available for Operating Lease [Line Items]
Number of properties	3,152	623
Net book value	545,931	86,509
Single-Family Properties Held for Sale [Member]
Property Subject to or Available for Operating Lease [Line Items]
Number of properties	44
Net book value	$ 6,569