Accumulated Other Comprehensive Loss - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 25, 2018	Mar. 26, 2017	Dec. 31, 2017	[1]
Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss	$ (2,836,000)		$ (2,030,000)
Reclassification losses from accumulated other comprehensive loss to net income	0	$ 0
Accumulated Other Comprehensive Loss [Member]
Other Comprehensive Income [Line Items]
Reclassification of certain tax effects from accumulated other comprehensive income	$ (351,000)

[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.