Subsequent Events - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified			0 Months Ended			0 Months Ended		0 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Apr. 29, 2014 London Interest Bank Offer Rate	Oct. 20, 2014 Subsequent Event Independence Realty Trust Inc Agreement Unit	Oct. 20, 2014 Subsequent Event Independence Realty Trust Inc Unit	Oct. 29, 2014 Subsequent Event Senior Notes	Oct. 29, 2014 Subsequent Event Senior Notes	Oct. 29, 2014 Subsequent Event Senior Notes London Interest Bank Offer Rate	Oct. 29, 2014 Subsequent Event Junior Notes	Oct. 29, 2014 Subsequent Event Floating Rate Commercial Mortgage Loans
Subsequent Event [Line Items]
Number of purchase agreements to acquire an apartment residential portfolio				5
Number of units in apartment residential portfolio acquired					1,549
Aggregate purchase price				$ 162,500
Floating rate commercial mortgage loans and participation interests										219,378
Aggregate principal balance	$ 80,000	$ 86,000					$ 181,261		$ 38,117
Advance rate							82.60%
LIBOR plus interest rate			1.79%					1.75%
Stated maturity of FL3 notes						2031-12
Redemption date						2016-10