Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2012		Dec. 30, 2011		Dec. 31, 2010
Allowance For Bad Debt
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 819		$ 702		$ 788
Provision Charged to Expense	483		709		641
Provision Charged to Revenues	0		0		0
Written-off Net of Recoveries	(369)	[1]	(592)	[1]	(727)	[1]
Balance at End of Year	933		819		702
Allowance For Contract Losses
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	1,520		1,424		1,929
Provision Charged to Expense	0		0		0
Provision Charged to Revenues	1,280		1,278		1,168
Written-off Net of Recoveries	(1,067)	[1]	(1,182)	[1]	(1,673)	[1]
Balance at End of Year	$ 1,733		$ 1,520		$ 1,424

[1] Balance includes currency translation adjustments.