Acquisitions (BDO) (Detail) - USD ($) $ in Thousands	Oct. 10, 2017	Dec. 31, 2017	Dec. 31, 2016	Jan. 16, 2015
Business Acquisition [Line Items]
Accounts receivable	$ 14,668
Other assets	734
Inventories	103,876
Property and equipment	24,179			$ 1,600
Customer relationships	29,660
Above-market leases	567
Goodwill	48,609	$ 49,464	$ 856
Total assets acquired	222,293
Accounts payable and accrued expenses	3,210
Other current liabilities	10,114
Total liabilities assumed	13,324
Total purchase price	$ 208,969
Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	153 months
Above Market Leases [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	144 months