Acquisitions, Dispositions, Leasing and Financing Activities - Intangible Assets Acquired and Intangible Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Finite-Lived Intangible Assets [Line Items]
Intangible assets carrying value	$ 17,810
Intangible assets acquired and intangible liabilities assumed, weighted average amortization period	9 years
In Place Lease Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets carrying value	6,542
Intangible assets acquired and intangible liabilities assumed, weighted average amortization period	6 years 2 months 12 days
Above Market Lease Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets carrying value	2,867
Intangible assets acquired and intangible liabilities assumed, weighted average amortization period	5 years 9 months 18 days
Tenant Relationship Value [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets carrying value	7,388
Intangible assets acquired and intangible liabilities assumed, weighted average amortization period	13 years 3 months 18 days
Lease Commissions, Legal and Marketing Fees [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets carrying value	1,013
Intangible assets acquired and intangible liabilities assumed, weighted average amortization period	5 years 4 months 24 days
Below Market Lease [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets carrying value	$ (620)
Intangible assets acquired and intangible liabilities assumed, weighted average amortization period	4 years 2 months 12 days