Annual report pursuant to Section 13 and 15(d)

Real Estate and Intangible Assets - Weighted Average Amortization Period for Intangible Assets Acquired and Liabilities Assumed (Detail)

v3.8.0.1
Real Estate and Intangible Assets - Weighted Average Amortization Period for Intangible Assets Acquired and Liabilities Assumed (Detail)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization period 10 years 2 months 12 days 12 years 6 months
In-Place Leases    
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization period 9 years 4 months 24 days 11 years 6 months
Leasing Costs    
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization period 9 years 4 months 24 days 11 years 6 months
Customer Relationships    
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization period 12 years 9 months 18 days 15 years 9 months 18 days
Above Market Leases    
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization period 10 years 5 years 2 months 12 days
Below Market Leases    
Finite-Lived Intangible Assets [Line Items]    
Weighted average amortization period 8 years 4 months 24 days 7 years 10 months 24 days