Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Recurring [Member] - USD ($) $ in Thousands	Apr. 01, 2018	Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Long-term debt	$ 368,000	$ 348,000
Interest rate swap liability		1,064
Total liabilities	368,000	349,064
Interest rate swap asset	3,415
Closed store reserves	764	811
Total assets	4,179	811
Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Long-term debt	368,000	348,000
Interest rate swap liability		1,064
Total liabilities	368,000	349,064
Interest rate swap asset	3,415
Total assets	3,415
Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Closed store reserves	764	811
Total assets	$ 764	$ 811