Store Acquisitions and Dispositions (Detail) $ in Thousands		3 Months Ended						9 Months Ended
	Mar. 01, 2021 USD ($) store	Sep. 30, 2021 USD ($) store	Jun. 30, 2021 USD ($) store	Mar. 31, 2021 USD ($) store	Sep. 30, 2020 USD ($) store	Jun. 30, 2020 USD ($) store	Mar. 31, 2020 USD ($) store	Sep. 30, 2021 USD ($) store	Sep. 30, 2020 USD ($) store
Real Estate [Abstract]
Number of Stores | store		12	15	9	8	0	2	36	10
Total Consideration Paid		$ 186,689	$ 193,783	$ 151,884	$ 101,731	$ 0	$ 19,399	$ 532,356	$ 121,130
Cash Paid		185,497	190,729	148,940	86,996	0	19,354	525,166	106,350
Loan Assumed		0	0	0	0	0	0	0	0
Finance Lease Liability		445	0	0	13,833	0	0	445	13,833
Investments in Real Estate Ventures		0	2,673	0	0	0	0	2,673	0
Net Liabilities/ (Assets) Assumed		$ 747	$ 381	$ 2,944	$ 902	$ 0	$ 45	$ 4,072	$ 947
Number of stores acquired, subject to finance land leases | store		1			2
Number of stores acquired, previously held in joint ventures | store			2
Number of stores sold | store	16
Proceeds from sale of real estate assets and investments in real estate ventures	$ 132,759
Equity Ownership %	55.00%
Real estate exchanged for interest in joint venture	$ 33,878
Gain on sale	$ 64,804