Commitments and Contingencies (Detail) $ in Thousands	Sep. 30, 2020 USD ($) store
Commitment to acquire stores
Other Commitments [Line Items]
Number of real estate properties to be acquired	14
Purchase price | $	$ 157,875
Commitment to acquire stores, scheduled to close in 2020
Other Commitments [Line Items]
Number of real estate properties to be acquired	13
Commitment to acquire stores, expected to close in 2021
Other Commitments [Line Items]
Number of real estate properties to be acquired	1
Commitment to acquire stores with joint venture partners
Other Commitments [Line Items]
Number of real estate properties to be acquired	1
Purchase price | $	$ 1,600
Commitment to acquire stores with joint venture partners, expected to close in 2021
Other Commitments [Line Items]
Number of real estate properties to be acquired	1