Summary of Investments in Real Estate (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014 Property		Dec. 31, 2013 Property
Real Estate Properties [Line Items]
Number of Properties	74		62
Investments in real estate, Book Value	$ 1,414,520		$ 1,131,931
Accumulated depreciation and amortization	145,751	[1]	127,745	[1]
Independence Realty Trust Inc
Real Estate Properties [Line Items]
Number of Properties	19
Number of units	5,342
Investments in real estate, Book Value	362,323
Accumulated depreciation and amortization	$ 18,804

[1] Includes 19 apartment properties owned by Independence Realty Trust, Inc., with 5,342 units and a book value of $362,323 and accumulated depreciation of $18,804 as of June 30, 2014.