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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
OperatingSegment
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Summary Of Significant Accounting Policies [Line Items]      
Interest expense and loan cost amortization $ 45.3 $ 31.5 $ 11.5
Capitalized amount of interest 2.3 1.0 $ 0.7
Accumulated amortization of loan costs $ 7.8 $ 4.3  
Lease, initial term 3 months    
Lease termination, notice period 30 days    
Annualized return of investment 6.00%    
Number of segment | OperatingSegment 1    
Building and Building Improvements | Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Real estate assets, estimated useful life 39 years    
Building and Building Improvements | Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Real estate assets, estimated useful life 15 years