Quarterly report pursuant to Section 13 or 15(d)

Organization, Basis of Presentation and Significant Accounting Policies (Detail)

v3.19.1
Organization, Basis of Presentation and Significant Accounting Policies (Detail)
$ in Thousands
Mar. 31, 2019
USD ($)
agreement
Jan. 01, 2019
Dec. 31, 2018
USD ($)
Lessee, Lease, Description [Line Items]      
Right-of-use assets from operating leases $ 5,948   $ 0
Operating lease liabilities $ 5,948   $ 0
Number of operating ground lease arrangements | agreement 4    
Minimum      
Lessee, Lease, Description [Line Items]      
Discount rate, basis spread on variable rate   2.50%  
Maximum      
Lessee, Lease, Description [Line Items]      
Discount rate, basis spread on variable rate   2.60%  
ASU 2016-02      
Lessee, Lease, Description [Line Items]      
Right-of-use assets from operating leases $ 6,000    
Operating lease liabilities $ 6,000