Investments in Real Estate - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Rancho Pacifica Park
ASSETS
Land	$ 121,329
Buildings and improvements	85,336
Tenant improvements	1,440
Acquired lease intangible assets	8,852
Other acquired assets	5
Total assets acquired	216,962
Liabilities
Acquired lease intangible liabilities	6,264
Other assumed liabilities	1,126
Total liabilities assumed	7,390
Net assets acquired	$ 209,572
Weighted average amortization period	3 years 6 months
Rancho Pacifica Park | In-place lease intangibles
Liabilities
Weighted average amortization period	3 years 2 months 12 days
Other 2017 Acquisitions
ASSETS
Land	$ 147,757
Buildings and improvements	159,905
Tenant improvements	4,662
Acquired lease intangible assets	17,144
Other acquired assets	144
Total assets acquired	329,612
Liabilities
Acquired lease intangible liabilities	5,032
Other assumed liabilities	2,044
Total liabilities assumed	7,076
Net assets acquired	322,536
In-place lease intangibles	15,800
Above-market lease intangibles	$ 1,300
Weighted average amortization period	3 years 3 months 18 days
Other 2017 Acquisitions | In-place lease intangibles
Liabilities
Weighted average amortization period	4 years 7 months 6 days
Other 2017 Acquisitions | Above Market Leases
Liabilities
Weighted average amortization period	11 years 1 month 6 days
Total 2017 Acquisitions
ASSETS
Land	$ 269,086
Buildings and improvements	245,241
Tenant improvements	6,102
Acquired lease intangible assets	25,996
Other acquired assets	149
Total assets acquired	546,574
Liabilities
Acquired lease intangible liabilities	11,296
Other assumed liabilities	3,170
Total liabilities assumed	14,466
Net assets acquired	$ 532,108