Employee Benefit Plans - Additional Information (Details)	3 Months Ended			3 Months Ended						3 Months Ended
	Mar. 31, 2015 Deferred Compensation Plan USD ($)	Mar. 31, 2015 Before Agreement USD ($)	Mar. 31, 2015 After Agreement USD ($)	Mar. 31, 2015 Pension Plan, Defined Benefit USD ($)	Dec. 31, 2014 Pension Plan, Defined Benefit USD ($)	Jun. 30, 2012 Pension Plan, Defined Benefit USD ($)	Jun. 30, 2012 Pension Plan, Defined Benefit GBP (£)	Mar. 31, 2015 Pension Plan, Defined Benefit Zetex [Member] USD ($)	Mar. 31, 2015 Pension Plan, Defined Benefit Zetex [Member] GBP (£)	Mar. 31, 2015 Pension Plan, Defined Benefit Maximum USD ($)	Mar. 31, 2014 Pension Plan, Defined Benefit Maximum USD ($)
Employee Benefit Plans Additional Information [Abstract]
Defined Benefit Plans, General Information				We have a contributory defined benefit plan that covers certain employees in the United Kingdom (“U.K.”). The net pension and supplemental retirement benefit obligations and the related periodic costs are based on, among other things, assumptions regarding the discount rate, estimated return on plan assets and mortality rates. These obligations and related periodic costs are measured using actuarial techniques and assumptions.
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.
Net period benefit costs										$ 1,000,000	$ 1,000,000
Deferred Compensation Plan Assets	5,000,000
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 March 31, 2015, 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.
Change in Plan Assets [Roll Forward]
Weighted average discount rate benefit obligations				3.40%
Estimated Future Pension Benefit Payments [Abstract]
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year, Description				During the second quarter of 2012, we adopted a payment plan with the trustees of the defined benefit plan, in which we would pay approximately British Pound (“GBP”) 2 million (approximately $3 million based on a USD:GBP exchange rate of 1.6:1) every year from 2012 through 2019. In 2015, based on the pension deficit, we adopted (as required every three years) an amended payment plan that Zetex had in place with the trustees of the defined benefit plan in which we will pay contributions of approximately GBP 2 million (approximately $3 million based on a USD:GBP exchange rate of 1.6:1) annually through 2030. This revised payment plan resulted in an increase of total required contributions from $13 million to $49 million to match the underfunded status as of March 31, 2015.
Defined Benefit Plan, Expected Future Benefit Payments						3,000,000	2,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Year One						3,000,000	2,000,000	3,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Two						3,000,000	2,000,000	3,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Three						3,000,000	2,000,000	3,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Four						3,000,000	2,000,000	3,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Five						3,000,000	2,000,000	3,000,000
Defined Benefit Plan Expected Future Benefit Payments In Ten Fiscal Years Thereafter								3,000,000	2,000,000
Defined Benefit Plan, Expected Future Benefit Payments in Three Fiscal Years Thereafter						3,000,000	2,000,000
USD:GBP exchange rate						0.625
Defined Benefit Plan Benefit Obligation, Outstanding Balance		$ 13,000,000	$ 49,000,000	$ 160,563,000	$ 159,715,000