FAIR VALUE - Summary of Available-for-Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 88,681	$ 70,819
Gross Unrealized Gains	74	56
Gross Unrealized Losses	(8)	(21)
Total short-term investments	88,747	70,854
Certificates of deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,601
Total short-term investments	1,601
State, municipal and local government agencies bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	47,672	38,785
Gross Unrealized Gains	61	46
Gross Unrealized Losses	(3)	(6)
Total short-term investments	47,730	38,825
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	27,020	18,613
Gross Unrealized Gains	11	6
Gross Unrealized Losses	(5)	(15)
Total short-term investments	27,026	18,604
Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,387	4,195
Gross Unrealized Gains	1
Total short-term investments	10,388	4,195
U.S. federal government bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,001	9,226
Gross Unrealized Gains	1	4
Total short-term investments	$ 2,002	$ 9,230