Segment Reporting Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 27, 2015	Jun. 30, 2016	Jun. 27, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales to external customers	$ 78,538	$ 83,775	$ 154,286	$ 153,714
Depreciation and amortization	3,266	2,739	6,352	5,232
Operating income	4,497	5,424	8,827	7,280
Long-lived assets	75,928	74,523	75,928	74,523
Capital expenditures	523	3,637	2,580	6,073
Total assets	423,348	421,826	423,348	421,826	$ 409,186
Americas Region
Segment Reporting Information [Line Items]
Net sales to external customers	32,344	38,960	66,843	69,358
Depreciation and amortization	1,753	1,617	3,503	3,139
Operating income	(1,246)	1,117	(290)	(1,057)
Long-lived assets	47,660	49,356	47,660	49,356
Capital expenditures	205	2,400	785	4,035
Total assets	199,475	220,756	199,475	220,756
Europe/Africa Region
Segment Reporting Information [Line Items]
Net sales to external customers	26,999	26,501	49,426	48,710
Depreciation and amortization	1,102	794	2,058	1,405
Operating income	2,294	(400)	942	(367)
Long-lived assets	25,349	22,451	25,349	22,451
Capital expenditures	163	1,076	1,422	1,672
Total assets	138,147	124,476	138,147	124,476
Asia-Pacific Region
Segment Reporting Information [Line Items]
Net sales to external customers	19,195	18,314	38,017	35,646
Depreciation and amortization	411	328	791	688
Operating income	3,449	4,707	8,175	8,704
Long-lived assets	2,919	2,716	2,919	2,716
Capital expenditures	155	161	373	366
Total assets	$ 85,726	$ 76,594	$ 85,726	$ 76,594