Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3
Organization, Basis of Presentation and Significant Accounting Policies (Detail)
$ in Thousands
Sep. 30, 2019
USD ($)
Jan. 01, 2019
USD ($)
agreement
Lessee, Lease, Description [Line Items]    
Right-of-use assets from operating leases | $ $ 5,846  
Operating lease liabilities | $ $ 5,886  
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%