Employee Benefit Plans - Additional Information (Details)	12 Months Ended														12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2014 Deferred Compensation Share Based Payments USD ($)	Dec. 31, 2014 UNITED STATES USD ($)	Dec. 31, 2014 TAIWAN, PROVINCE OF CHINA	Dec. 31, 2014 CHINA	Dec. 31, 2014 Equity Securities	Dec. 31, 2014 Debt Securities	Dec. 31, 2014 Equity Funds	Dec. 31, 2014 Maximum	Dec. 31, 2014 Minimum CHINA	Dec. 31, 2014 Pension Plan, Defined Benefit USD ($)	Dec. 31, 2014 Pension Plan, Defined Benefit GBP (£)	Dec. 31, 2013 Pension Plan, Defined Benefit Maximum USD ($)
Employee Benefit Plans Additional Information [Abstract]
Defined Benefit Plans, General Information													In connection with the Zetex acquisition, we adopted a contributory defined benefit plan that covers certain employees in the U.K. The defined benefit plan is closed to new entrants and frozen with respect to future benefit accruals. The retirement benefit is based on the final average compensation and service of each eligible employee. We determined the fair value of the defined benefit plan assets and utilizes an annual measurement date of December 31. At subsequent measurement dates, defined benefit plan assets will be determined based on fair value. Defined benefit plan assets consist primarily of high quality corporate bonds that are denominated in the currency in which the benefits will be paid and that have terms to maturity approximating the terms of the related pension liability. The net pension and supplemental retirement benefit obligations and the related periodic costs are based on, among other things, assumptions of the discount rate, estimated return on plan assets and mortality rates. These obligations and related periodic costs are measured using actuarial techniques and assumptions.
Net period benefit costs	$ 1,317,000	$ 380,000											$ 1,000,000		$ 1,000,000
Accumulated Comprehensive loss Defined Benefit Plan	35,719,000	28,164,000
Underfunded pension and postretirement obligation, Noncurrent	37,000,000
Defined Benefit Plan Recognized Gain Loss Increase Decrease	7,000,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	9,000,000
Defined Benefit Plan Amortization Of Net Gains Losses Average Term	13 years
Defined Benefit Plan, Pension, Method to Determine Vested Benefit Obligation													The projected unit credit method is the actuarial cost method used to compute the pension liabilities and related expenses.
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year, Description													We adopted a payment plan with the trustees of the defined benefit plan, in which we will pay approximately GBP2 million every year from 2012 through 2019.
Defined Benefit Plan, Expected Future Benefit Payments in Year One	3,727,000													2,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	4,273,000													2,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	4,327,000													2,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	4,475,000													2,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	4,756,000													2,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Three Fiscal Years Thereafter														2,000,000
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities								48.00%	40.00%	12.00%
Employer matching contribution percentage					6.00%	6.00%					22.00%	10.00%
Employee salary deferral contributions percentage					100.00%
Employer matching contribution percent of match					3.00%
Employer matching contribution amount of match					1
Defined contribution plan employer matching contribution amount	2
401 (k) Retirement Plan [Abstract]
Description of Defined Contribution Pension and Other Postretirement Plans					We maintain a 401(k) retirement plan (“the Plan”) for the benefit of qualified employees at our U.S. locations. Employees who participate may elect to make salary deferral contributions to the Plan up to 100% of the employees’ eligible payroll subject to annual Internal Revenue Code maximum limitations. We currently makes a matching contribution of $1 for every $2 contributed by the participant up to 6% (3% maximum matching) of the participant’s eligible payroll, which vests over four years. In addition, we may make a discretionary contribution to the entire qualified employee pool, in accordance with the Plan.	Pursuant to the Taiwan Labor Standard Law and Factory Law, we maintain a retirement plan for the employees in Taiwan, whereby we make contributions at a rate of 6% of the employee’s eligible payroll.	As stipulated by the regulations of China, we maintain a retirement plan pursuant to the local municipal government for the employees in China. We are required to make contributions to the retirement plan at a rate between 10% and 22% of the employee’s eligible payroll.
Defined Contribution Plan, Cost Recognized	13,000,000	6,000,000	5,000,000
Deferred Compensation Plan [Abstract]
Deferred Compensation Arrangements, Overall, Description				We maintain a Non-Qualified Deferred Compensation Plan (the “Deferred Compensation Plan”) for executive officers, key employees and members of the Board of Directors (the “Board”). The Deferred Compensation Plan allows eligible participants to defer the receipt of eligible compensation, including equity awards, until designated future dates. We offset our obligations under the Deferred Compensation Plan by investing in the actual underlying investments. These investments are classified as trading securities and are carried at fair value. At December 31, 2014, these investments totaled approximately $5 million. All gains and losses in these investments are materially offset by corresponding gains and losses in the deferred compensation plan liabilities.
Share-based Compensation Arrangement by Share-based Payment Award, Description				We maintain share-based compensation plans for our Board, officers and key employees, which provide for stock options and stock awards under our equity incentive plans.
Deferred Compensation Plan Assets				$ 5,000,000