Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Schedule Of Income Taxes [Line Items]
Cumulative U.S. GAAP pretax loss from continuing operations	$ 43,200,000
Valuation allowance	37,023,000	36,064,000
State income taxes reduced by research tax credits	500,000	700,000	600,000
Net operating loss carryforwards, state	21,800,000
Net operating loss carryforwards, federal	15,800,000
Net operating loss carryforwards, foreign	11,800,000
Tax credit carryforwards, federal	6,300,000
Tax credit carryforwards, state	13,200,000
Accumulated undistributed earnings not provided of U.S. income taxes	32,000,000
Tax holidays expiration date	These holidays or incentives require compliance with certain conditions and expire at various dates through 2023.
Unrecognized tax benefits if recognized would reduce income tax expense and effective rate	6,200,000	6,200,000
Accrued payment of interest and penalties	1,400,000	1,500,000
Interest expense recognized		(100,000)	100,000
Earliest tax year [Member]
Schedule Of Income Taxes [Line Items]
Net operating loss carryforwards, expiration year	2015
Latest tax year [Member]
Schedule Of Income Taxes [Line Items]
Net operating loss carryforwards, expiration year	2034
Internal Revenue Service [Member] | Ismeca [Member]
Schedule Of Income Taxes [Line Items]
Net operating loss carryforwards, federal	$ 5,100,000
Minimum [Member]
Schedule Of Income Taxes [Line Items]
Tax credit carryforwards, expiration date	Dec. 31, 2015
Time period for assessment and collection of income taxes	4 years
Maximum [Member]
Schedule Of Income Taxes [Line Items]
Tax credit carryforwards, expiration date	Dec. 31, 2034
Time period for assessment and collection of income taxes	10 years