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	$ 33,526	$ 29,790
Total deferred leasing intangibles, net, included in total liabilities	12,726	13,626
In-Place Leases
Finite-Lived Intangible Assets [Line Items]
Total deferred leasing intangibles, net, included in total assets	16,850	15,676
Above Market Leases
Finite-Lived Intangible Assets [Line Items]
Total deferred leasing intangibles, net, included in total assets	3,425	3,994
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	11,428	10,120
Below Market Leases
Finite-Lived Intangible Assets [Line Items]
Total deferred leasing intangibles, net, included in total liabilities	$ 12,726	$ 13,626