Treasury Stock - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Oct. 19, 2016	Oct. 21, 2015
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount			$ 35,000,000	$ 35,000,000
Purchase of treasury shares (in shares)		235,164
Repurchase of treasury shares		$ 7,004,000
Remaining authorized amount for repurchase of common stock	$ 45,376,000
Treasury stock reissued at lower than repurchase price	$ 5,892,000	$ 5,667,000