Investments Narrative (Details) (J-Devices [Member], USD $) In Millions, unless otherwise specified	1 Months Ended
	Apr. 30, 2013	Oct. 31, 2009	Jun. 30, 2014	Dec. 31, 2013	Mar. 31, 2013
Schedule of Equity Method Investments [Line Items]
Ownership interest	60.00%		60.00%	60.00%	30.00%
Payments to acquire equity method investments (in dollars and yen)	$ 67.4	$ 16.7
Ownership Threshold 2014 [Member]
Schedule of Equity Method Investments [Line Items]
Maximum ownership ratio of call options			66.00%
Ownership Threshold 2015 [Member]
Schedule of Equity Method Investments [Line Items]
Maximum ownership ratio of call options			80.00%
Minimum ownership threshold, put option			80.00%
Amkor [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest			60.00%
Former NMD Shareholders [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest			34.00%
Toshiba [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest			6.00%