Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
Organization, Basis of Presentation and Significant Accounting Policies (Detail)
$ in Thousands
Jun. 30, 2019
USD ($)
agreement
Jan. 11, 2019
USD ($)
Jan. 01, 2019
USD ($)
agreement
Lessee, Lease, Description [Line Items]      
Right-of-use assets from operating leases | $ $ 5,897    
Operating lease liabilities | $ $ 5,924    
Number of operating ground lease arrangements 4    
ASU 2016-02      
Lessee, Lease, Description [Line Items]      
Right-of-use assets from operating leases | $     $ 6,000
Operating lease liabilities | $   $ 6,000  
Number of fixed rental charges operating ground lease arrangements     3
Number of variable charges operating ground lease arrangements     1
Number of options to extend operating ground lease arrangements     3
Number of early termination options operating ground lease arrangements     1
ASU 2016-02 | Minimum      
Lessee, Lease, Description [Line Items]      
Discount rate, basis spread on variable rate     2.50%
ASU 2016-02 | Maximum      
Lessee, Lease, Description [Line Items]      
Discount rate, basis spread on variable rate     2.60%