Commitments and Contingencies - Additional Information (Detail) $ in Thousands	Sep. 30, 2018 USD ($) store
Commitment To Acquire Retail Space
Other Commitments [Line Items]
Number of real estate properties to be acquired	13
Purchase price | $	$ 161,356
Commitment To Acquire Retail Space, Closing In 2018
Other Commitments [Line Items]
Purchase price | $	$ 91,433
Number of stores scheduled to be closed	7
Commitment To Acquire Retail Space, Closing in 2019
Other Commitments [Line Items]
Purchase price | $	$ 59,395
Number of stores scheduled to be closed	5
Commitment To Acquire Retail Space, Closing after 2019
Other Commitments [Line Items]
Purchase price | $	$ 10,528
Number of stores scheduled to be closed	1
Commitment To Acquire Retail Space With Joint Venture Partners
Other Commitments [Line Items]
Number of real estate properties to be acquired	18
Purchase price | $	$ 62,490
Commitment To Acquire Retail Space With Joint Venture Partners, Scheduled To Close in 2018
Other Commitments [Line Items]
Number of stores scheduled to be closed	12
Commitment To Acquire Retail Space With Joint Venture Partners, Expected to Close in 2019
Other Commitments [Line Items]
Number of stores scheduled to be closed	6