Segment Reporting Information (Detail) (USD $) In Thousands, unless otherwise specified	3 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	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Net sales to external customers	$ 104,153	$ 82,239	$ 82,060	$ 73,374	$ 89,895	$ 68,190	$ 68,329	$ 65,370	$ 341,826	$ 291,784	$ 273,395
Depreciation and amortization									7,428	7,038	6,976
Operating income									37,340	30,154	31,554
Long-lived assets	57,659				43,921				57,659	43,921	41,208
Capital expenditures									18,722	6,440	4,672
Total assets	425,463				391,496				425,463	391,496	350,807
Americas Region
Segment Reporting Information [Line Items]
Net sales to external customers									138,968	120,435	108,616
Depreciation and amortization									3,989	4,012	4,294
Operating income									7,490	6,270	2,949
Long-lived assets	37,013				23,791				37,013	23,791	21,775
Capital expenditures									12,347	3,563	1,435
Total assets	222,273				201,679				222,273	201,679	179,594
Europe/Africa Region
Segment Reporting Information [Line Items]
Net sales to external customers									120,179	103,415	100,111
Depreciation and amortization									2,090	1,880	1,658
Operating income									8,811	6,417	10,703
Long-lived assets	17,599				17,409				17,599	17,409	16,871
Capital expenditures									4,799	1,558	1,672
Total assets	124,535				122,197				124,535	122,197	110,152
Asia-Pacific Region
Segment Reporting Information [Line Items]
Net sales to external customers									82,679	67,934	64,668
Depreciation and amortization									1,349	1,146	1,024
Operating income									21,039	17,467	17,902
Long-lived assets	3,047				2,721				3,047	2,721	2,562
Capital expenditures									1,576	1,319	1,565
Total assets	$ 78,655				$ 67,620				$ 78,655	$ 67,620	$ 61,061