Acquisitions - Schedule of Acquisition Cost of Shopping Centers (Detail) - Shopping Center Acquired [Member] $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Business Acquisition [Line Items]
Land	$ 23,588
Buildings	35,659
Tenant improvements	8,565
Other assets	419
Assets acquired	82,216
Less: Below-market leases	(1,872)
Less: Other liabilities assumed	(581)
Net assets acquired	79,763
In-Place Leases (Including Lease Origination Costs and Fair Market Value of Leases) [Member]
Business Acquisition [Line Items]
Intangible assets acquired	$ 7,051
Weighted Average Amortization Period	16 years
Tenant Relations [Member]
Business Acquisition [Line Items]
Intangible assets acquired	$ 6,934
Weighted Average Amortization Period	16 years 3 months 18 days
Below-Market Leases [Member]
Business Acquisition [Line Items]
Weighted Average Amortization Period	20 years