Debt - Summary of Mortgages, Notes Payable and Capital Lease Obligation (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Debt Instrument [Line Items]
Senior unsecured notes	$ 210,000		$ 110,000
Unsecured term loan facilities	210,000		255,000
Total mortgage debt	301,029		333,049
Unsecured revolving credit facility	0		27,000
Junior subordinated notes	28,125		28,125
Subtotal debt	746,328		750,000
Capital lease obligation	5,510	[1]	5,686	[1]
Unamortized premium	2,826		3,174
Total notes payable	749,154		753,174
Fixed Rate Mortgages
Debt Instrument [Line Items]
Total mortgage debt	298,203		329,875
Unamortized premium	$ 2,800		$ 3,200

[1] 99 year ground lease expires 9/30/2103. However, an anchor tenant’s exercise of its option to purchase its parcel in October 2014 would require us to purchase the real estate that is subject to the ground lease.