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)

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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
Acquired Finite-Lived Intangible Assets [Line Items]    
All intangible assets and liabilities 7 years 14 years 2 months 12 days
Leasehold interests – land    
Acquired Finite-Lived Intangible Assets [Line Items]    
All intangible assets and liabilities 6 years 10 months 24 days 0 years
In-place leases    
Acquired Finite-Lived Intangible Assets [Line Items]    
All intangible assets and liabilities 6 years 3 months 18 days 8 years 8 months 12 days
Leasing costs    
Acquired Finite-Lived Intangible Assets [Line Items]    
All intangible assets and liabilities 8 years 9 months 18 days 11 years 7 months 6 days
Above-market lease values and lease incentives    
Acquired Finite-Lived Intangible Assets [Line Items]    
All intangible assets and liabilities 5 years 4 months 24 days 0 years
Below-market lease values and deferred revenue    
Acquired Finite-Lived Intangible Assets [Line Items]    
All intangible assets and liabilities 4 years 8 months 12 days 20 years 10 months 24 days