Acquired Intangible Assets - Schedule of Amortization for Acquired Intangible Assets (Detail)	Dec. 31, 2016 USD ($)
Above Market Leases [Member] | Lessor [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2017	$ 148,000
2018	47,000
2019	30,000
2020	24,000
2021	16,000
Thereafter	179,000
Total	444,000
Below Market Leases [Member] | Lessor [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2017	1,833,000
2018	1,781,000
2019	1,701,000
2020	1,463,000
2021	1,322,000
Thereafter	14,439,000
Total	22,539,000
Below Market Leases [Member] | Lessee [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2017	320,000
2018	317,000
2019	312,000
2020	222,000
2021	157,000
Thereafter	755,000
Total	2,083,000
In-Place Leases [Member] | Lessor [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2017	1,389,000
2018	1,363,000
2019	1,342,000
2020	1,322,000
2021	1,301,000
Thereafter	14,267,000
Total	$ 20,984,000