Summary of Significant Accounting Policies - Deferred Leasing Intangibles Included in Total Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Total deferred leasing intangibles, net, included in total assets	$ 30,704	$ 26,581
Total deferred leasing intangibles, net, included in total liabilities	11,097	11,879
In-Place Leases
Finite-Lived Intangible Assets [Line Items]
Total deferred leasing intangibles, net, included in total assets	15,441	14,045
Above Market Leases
Finite-Lived Intangible Assets [Line Items]
Total deferred leasing intangibles, net, included in total assets	2,504	3,004
Below Market Ground Lease Obligation
Finite-Lived Intangible Assets [Line Items]
Total deferred leasing intangibles, net, included in total assets	1,823	0
Tenant Relationships
Finite-Lived Intangible Assets [Line Items]
Total deferred leasing intangibles, net, included in total assets	10,936	9,532
Below Market Leases
Finite-Lived Intangible Assets [Line Items]
Total deferred leasing intangibles, net, included in total liabilities	$ 11,097	$ 11,879