Assets and Liabilities of Consolidated Variable Interest Entities (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Variable Interest Entity [Line Items]
Real estate, accumulated depreciation	$ 155,815	[1]	$ 127,745	[1]
Deferred financing costs, accumulated amortization	23,829		17,768
Intangible assets, accumulated amortization	10,941		4,564
Indebtedness, fair value	444,190		389,146
Variable Interest Entities
Variable Interest Entity [Line Items]
Real estate, accumulated depreciation	24,290		18,538
Deferred financing costs, accumulated amortization	19,993		17,107
Intangible assets, accumulated amortization	3,495		568
Indebtedness, fair value	$ 431,142		$ 377,235

[1] As of September 30, 2014, includes 22 apartment properties owned by Independence Realty Trust, Inc., with 6,470 units and a book value of $444,050 and accumulated depreciation of $20,848. As of December 31, 2013, includes 10 apartment properties owned by Independence Realty Trust, Inc., with 2,790 units and a book value of $190,096 and accumulated depreciation of $15,775.