v3.7.0.1
Acquisitions - Purchase Price Allocation for Acquisitions (Parenthetical) - (Detail)
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Acquired In-Place Leases    
Business Acquisition [Line Items]    
Weighted average amortization period 18 years 18 years
Acquired Above-Market Leases    
Business Acquisition [Line Items]    
Weighted average amortization period 19 years 19 years
Acquired Below-Market Leases    
Business Acquisition [Line Items]    
Weighted average amortization period 18 years 18 years