Reconciliation of Segment Information to Consolidated Statements of Operations (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Reconciliation of Segment Information to Condensed Consolidated Statements of Operations
Segment income from operations	$ 54,864,000	$ 37,916,000	$ 125,680,000	$ 79,715,000
Unallocated amounts:
Share-based compensation expense	(14,917,000)	(8,094,000)	(45,812,000)	(30,336,000)
Gain (loss) from manufacturing facility damage and shutdown	3,571,000	0	(3,485,000)	0
Acquisition-related charges	(7,162,000)	(1,685,000)	(10,287,000)	(5,699,000)
French building underutilization and other	(822,000)	0	(3,284,000)	0
Restructuring (charges) credits	(840,000)	(8,149,000)	967,000	(51,545,000)
Gain (loss) related to foundry arrangements	454,000	(8,938,000)	2,583,000	(7,424,000)
Fair value of adjustments from businesses acquired	(1,548,000)		(1,548,000)
Recovery of receivables from foundry supplier	0	0	0	522,000
Settlement charges	0	0	0	(21,600,000)
Gain on sale of assets	0	0	0	4,430,000
Consolidated income (loss) from operations	33,600,000	11,050,000	64,814,000	(31,937,000)
Micro-Controllers
Reconciliation of Segment Information to Condensed Consolidated Statements of Operations
Segment income from operations	36,996,000	22,531,000	86,148,000	42,505,000
Nonvolatile Memories
Reconciliation of Segment Information to Condensed Consolidated Statements of Operations
Segment income from operations	11,329,000	8,275,000	24,413,000	18,439,000
RF and Automotive
Reconciliation of Segment Information to Condensed Consolidated Statements of Operations
Segment income from operations	5,689,000	3,664,000	15,727,000	6,377,000
Multi-market and other
Reconciliation of Segment Information to Condensed Consolidated Statements of Operations
Segment income from operations	$ 850,000	$ 3,446,000	$ (608,000)	$ 12,394,000