Store Acquisitions and Dispositions - Schedule of Operating Properties Acquired (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) store	Mar. 31, 2018 USD ($) store
Real Estate [Abstract]
Number of Stores | store	14	5
Total Consideration Paid	$ 223,740	$ 70,787
Cash Paid	202,890	70,171
Loan Assumed	17,157	0
Investments in Real Estate Ventures	2,780	489
Net Liabilities/ (Assets) Assumed	913	127
Real estate assets	$ 223,740	$ 70,787
Number of stores acquired, previously held noncontrolling interest | store	12	1