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Leases - Additional Information (Detail)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Operating Lease, Weighted Average Remaining Lease Term 17 years 17 years
Lessee, Operating Lease, Option to Extend   the vast majority of which include one or more options to extend the leases for up to five years resulting in lease terms up to 40 years.
Amortization Of ROU assets $ 7,500 $ 23,800
Residual value of leased asset 70,500 70,500
Direct financing lease, Net investment in lease 1,146,400 1,146,400
Other Income [Member]    
Gain on sale of branch property $ 7,900 7,900
Discontinued Operations [Member]    
Amortization Of ROU assets   $ 11,700
Minimum [Member]    
Operating Lease, Weighted Average Remaining Lease Term 1 year 1 year
Lessor, operating lease, term of contract 24 months 24 months
Maximum [Member]    
Operating Lease, Weighted Average Remaining Lease Term 25 years 25 years
Lessor, operating lease, term of contract 120 months 120 months