Business Segment Information - Segment Assets (Detail) - USD ($) $ in Thousands	Jul. 04, 2015	Dec. 31, 2014	Jun. 28, 2014
Segment Reporting Information [Line Items]
Total Assets	$ 709,970	$ 747,599	$ 757,297
Total Goodwill and Intangibles	307,657	312,673
DAS
Segment Reporting Information [Line Items]
Total Assets	243,840	245,925
Total Goodwill and Intangibles	62,803	63,497
DLT
Segment Reporting Information [Line Items]
Total Assets	412,489	427,719
Total Goodwill and Intangibles	244,854	249,176
Corporate Administration
Segment Reporting Information [Line Items]
Total Assets	$ 53,641	$ 73,955