Investment in Real Estate - Summary of Intangible Assets (Liabilities) Subject to Amortization in Period of Acquisition (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
In-Place Leases
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired finite lived intangible assets, fair value	$ 5,350	$ 2,807
Acquired finite lived intangible assets, weighted average life	74 months	52 months
Tenant Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired finite lived intangible assets, fair value	3,440	1,914
Acquired finite lived intangible assets, weighted average life	131 months	112 months
Above Market Leases
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired finite lived intangible assets, fair value	316	0
Acquired finite lived intangible assets, weighted average life	66 months
Below Market Ground Lease Obligation
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired finite lived intangible assets, fair value	1,854	0
Acquired finite lived intangible assets, weighted average life	480 months
Below Market Leases
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired finite lived intangible assets, fair value	$ (940)	$ (188)
Acquired finite lived intangible assets, weighted average life	79 months	52 months