Share-Based Compensation (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for future equity grants (in shares)	1,100,000
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation	$ 6,400,000	$ 9,200,000	$ 11,500,000
Total income tax benefit recognized	2,900,000	1,000,000	4,500,000
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted	14,900,000
Weighted average period for recognition of unrecognized compensation cost	2 years 3 months 18 days
Weighted average grant-date fair values of options and weighted average assumptions used [Abstract]
Weighted average grant-date fair value of options per share (in dollars per share)	$ 4.01	$ 5.94	$ 7.22
Assumptions [Abstract]
Expected volatility (in hundredths)	54.40%	53.00%	51.90%
Expected dividends (in hundredths)	0.00%	0.00%	0.00%
Expected term	5 years 1 month 6 days	5 years 7 months 6 days	5 years 6 months
Risk-free rate (in hundredths)	2.00%	2.40%	3.20%
Aggregate Intrinsic Value [Abstract]
Cash received from option exercises	2,835,000	4,825,000	1,133,000
Tax benefit realized from option exercised	500,000
Share-Based Compensation Included in Cost of Services [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation	3,000,000	4,100,000	5,000,000
Share-Based Compensation Included in Selling, General and Administrative Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation	3,400,000	4,500,000	5,000,000
Share-Based Compensation Included in Restructuring and Related Charges [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation	0	600,000	1,500,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Shares [Roll Forward]
Outstanding, beginning of period (in shares)	5,659,000
Granted (in shares)	854,000
Exercised (in shares)	(402,000)
Forfeited (in shares)	(606,000)
Expired (in shares)	(816,000)
Outstanding, end of period (in shares)	4,689,000	5,659,000
Exercisable, end of period (in shares)	2,701,000
Weighted-Average Exercise Price [Roll Forward]
Outstanding, beginning of period (in dollars per share)	$ 17.58
Granted (in dollars per share)	$ 7.81
Exercised (in dollars per share)	$ 7.23
Forfeited (in dollars per share)	$ 10.60
Expired (in dollars per share)	$ 28.75
Outstanding, end of period (in dollars per share)	$ 15.65	$ 17.58
Exercisable, end of period (in dollars per share)	$ 19.51
Weighted-Average Remaining Contractual Term [Abstract]
Outstanding	5 years 6 months
Exercisable	3 years 4 months 24 days
Aggregate Intrinsic Value [Abstract]
Outstanding	2,886,000
Exercisable	278,000
Total intrinsic value of options exercised during period	1,300,000	1,900,000	1,900,000
Stock Options [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	7 years
Stock Options [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	10 years
Restricted Stock and Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Restricted Stock and Restricted Stock Units [Abstract]
Weighted average grant-date fair value of nonvested shares granted (in dollars per share)	$ 8.29	$ 13.26	$ 11.32
Total grant-date fair value of shares vested	$ 3,600,000	$ 7,400,000	$ 10,000,000
Shares [Roll Forward]
Nonvested, beginning of period (in shares)	910,000
Granted (in shares)	573,000
Vested (in shares)	(288,000)
Forfeited (in shares)	(182,000)
Nonvested, end of period (in shares)	1,013,000	910,000
Weighted-Average Grant Date Fair Value [Roll Forward]
Nonvested, beginning of period (in dollars per share)	$ 12.22
Granted (in dollars per share)	$ 8.29	$ 13.26	$ 11.32
Vested (in dollars per share)	$ 12.40
Forfeited (in dollars per share)	$ 10.68
Nonvested, end of period (in dollars per share)	$ 9.93	$ 12.22

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Period after which the share based compensation option awards expire, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D'.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

+ References

No definition available.

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- Definition

Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

+ References

No definition available.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

+ References

No definition available.

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

+ References

No definition available.

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- Definition

Number of share options (or share units) exercised during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28,29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

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