Derivatives - Additional Information (Detail) $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended
	Jul. 31, 2014 USD ($)	Mar. 31, 2015 USD ($)	Jun. 30, 2015 USD ($) Agreement
Derivative Instruments [Line Items]
Loss recognized in income on derivatives (ineffective portion and amount excluded from effectiveness testing)			$ 500
Repayments of Secured Debt			139,137
Estimate increase to interest expense			4,400
Fair value of derivatives in a net liability position			(3,200)
Termination value			$ (3,700)
Interest expense, mark to market		$ 500
Interest rate swaps [Member]
Derivative Instruments [Line Items]
Number of derivative, interest rate swap agreement | Agreement			16
Derivative, Weighted average interest rate			1.55%
Derivative, notional amount			$ 422,100
Interest Rate Swap Eleven [Member]
Derivative Instruments [Line Items]
Derivative Liability, Notional Amount, Ineffective		$ 40,000
Interest Rate Swap Twelve [Member]
Derivative Instruments [Line Items]
Maturity Date			Jan. 02, 2019
Net loss			$ 2,300
Settled Interest Rate Swaps [Member]
Derivative Instruments [Line Items]
Amortized period			10 years
The Gallery at Market East [Member]
Derivative Instruments [Line Items]
Repayments of Secured Debt	$ 25,800