Supplemental Quarterly Financial Data (Unaudited) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 31, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Jun. 28, 2014	Jun. 29, 2013	Sep. 27, 2014	Sep. 28, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Net Revenues	$ 187,612	$ 188,164	$ 186,516	$ 179,753	$ 187,975	$ 181,288	$ 191,472	$ 175,915	$ 366,269	$ 367,387	$ 554,433	$ 548,675	$ 742,045	$ 736,650	$ 747,037
Gross Profit	33,627	33,112	37,678	35,915	19,565	33,739	37,574	33,274	73,593	70,848	106,705	104,587	140,332	124,152	143,977
(Loss) Income Before Taxes	4,034	4,687	9,816	7,703	(7,359)	5,985	7,859	2,900	17,519	10,759	22,206	16,744	26,240	9,385	24,124
Income Tax Benefit	(1,122)	1,754	3,197	2,544	(2,115)	(1,000)	2,193	(1,071)	5,741	1,122	7,495	122	6,373	(1,993)	6,501
Net Income	$ 5,156	$ 2,933	$ 6,619	$ 5,159	$ (5,244)	$ 6,985	$ 5,666	$ 3,971	$ 11,778	$ 9,637	$ 14,711	$ 16,622	$ 19,867	$ 11,378	$ 17,623
Earnings (Loss) Per Share
Basic earnings per share (in dollars per share)	$ 0.47	$ 0.27	$ 0.61	$ 0.48	$ (0.49)	$ 0.65	$ 0.53	$ 0.37	$ 1.08	$ 0.91	$ 1.35	$ 1.56	$ 1.82	$ 1.06	$ 1.67
Diluted earnings per share (in dollars per share)	$ 0.46	$ 0.26	$ 0.60	$ 0.46	$ (0.49)	$ 0.64	$ 0.53	$ 0.37	$ 1.06	$ 0.90	$ 1.31	$ 1.54	$ 1.79	$ 1.05	$ 1.66