Business Segment Information - Financial Information by Reportable Segment (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
Segment Reporting Information [Line Items]
Net Revenues		$ 174,845	$ 186,516	$ 347,765	$ 366,269
Segment Operating Income		14,562	20,825	22,985	38,960
Operating Income		10,839	16,810	14,466	31,638
Depreciation and Amortization Expenses		6,514	7,699	13,428	15,125
Capital Expenditures		3,367	3,527	8,195	5,719
Operating Segments | DAS
Segment Reporting Information [Line Items]
Net Revenues		76,078	78,616	148,136	160,270
Segment Operating Income		6,870	10,068	9,008	21,159
Depreciation and Amortization Expenses		2,111	3,554	4,624	5,970
Capital Expenditures		2,417	1,435	5,751	2,720
Operating Segments | DLT
Segment Reporting Information [Line Items]
Net Revenues		98,767	107,900	199,629	205,999
Segment Operating Income		7,692	10,757	13,977	17,801
Depreciation and Amortization Expenses		4,361	4,043	8,720	9,051
Capital Expenditures		948	2,078	2,438	2,975
Operating Segments | Corporate Administration
Segment Reporting Information [Line Items]
Corporate General and Administrative Expenses	[1]	(3,723)	(4,015)	(8,519)	(7,322)
Depreciation and Amortization Expenses		42	102	84	104
Capital Expenditures		$ 2	$ 14	$ 6	$ 24

[1] Includes costs not allocated to either the DLT or DAS operating segments.