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Related Party Transactions - Selected Results Related to Vendor and Percentages (Detail) - Merchandise Inventory Purchase [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 29, 2016
Oct. 31, 2015
Oct. 29, 2016
Oct. 31, 2015
Related Party Transaction [Line Items]        
Purchases as a percent of total merchandise purchases 19.80% 15.60% 17.50% 14.20%
Vendor [Member]        
Related Party Transaction [Line Items]        
Purchases $ 16,318 $ 13,234 $ 33,257 $ 28,450
Cost of sales 9,125 7,668 24,753 20,852
Accounts payable outstanding at period end $ 8,614 $ 7,178 $ 8,614 $ 7,178