Supplemental Quarterly Financial Data (Unaudited) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Net Revenues	$ 142,258	$ 138,690	$ 140,938	$ 136,297	$ 142,486	$ 132,571	$ 133,437	$ 142,148	$ 558,183	$ 550,642	$ 666,011
Gross Profit	25,693	26,009	26,191	24,927	27,786	25,223	26,215	26,969	102,820	106,193	100,792
(Loss) Income Before Taxes	(5,057)	5,595	4,564	2,507	5,825	6,248	5,331	20,709	7,609	38,113	(106,590)
Income Tax (Benefit) Expense	(14,541)	940	741	392	2,989	1,234	1,470	7,159	(12,468)	12,852	(31,711)
Net Income	$ 9,484	$ 4,655	$ 3,823	$ 2,115	$ 2,836	$ 5,014	$ 3,861	$ 13,550	$ 20,077	$ 25,261	$ (74,879)
Earnings Per Share
Basic earnings (loss) per share (in dollars per share)	$ 0.84	$ 0.41	$ 0.34	$ 0.19	$ 0.25	$ 0.45	$ 0.35	$ 1.22	$ 1.78	$ 2.27	$ (6.78)
Diluted earnings (loss) per share (in dollars per share)	$ 0.82	$ 0.41	$ 0.33	$ 0.18	$ 0.25	$ 0.44	$ 0.34	$ 1.21	$ 1.74	$ 2.24	$ (6.78)