New Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 25, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax asset	$ 4,069	$ 2,750	[1]
Accumulated Other Comprehensive Loss [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of certain tax effects from accumulated other comprehensive income	$ (351)
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustment to beginning retained deficit		(15,000)
Contract liability, Current		2,400
Contract liability, Noncurrent		12,600
Deferred tax asset		$ 3,500
Term of franchise store agreement		10 years
Adjustment to retained deficit		$ (6,400)
Deferred tax liability		$ 1,600

[1] Note: The balance sheet at December 31, 2017 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.