Employee Purchase Plan Purchase Price Percentage of Fair Market Value

No definition available.

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- Definition

Number Of Share Based Compensation Plans

+ References

No definition available.

+ Details

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- Definition

Share Based Compensation Arrangement By Employee Stock Purchase Program Number Of Shares Available For Purchase

+ References

No definition available.

+ Details

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Distributed in Period

+ References

No definition available.

+ Details

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares that can be Granted to A Participant in Any Fiscal Year

+ References

No definition available.

+ Details

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award, Options, Expiration Term

+ References

No definition available.

+ Details

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- Definition

Shares Issued Under Executive Officer Employment Agreement

+ References

No definition available.

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

+ References

+ Details

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- Definition

The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

+ References

+ Details

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- Definition

Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

+ References

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(c)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph c(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

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

+ Details

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- Definition

The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

+ Details

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

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- Definition

The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

+ References

+ Details

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

+ Details

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- Definition

The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

Reference 2: 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

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 5

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Stock-Based Employee Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended			1 Months Ended	3 Months Ended	12 Months Ended				12 Months Ended
	Dec. 31, 2011 CompensationPlan	Dec. 31, 2010	Dec. 31, 2009	Jan. 31, 2009 Chief Executive Officer	Dec. 31, 2008 Chief Executive Officer	Dec. 31, 2011 Lower Limit	Dec. 31, 2011 Upper Limit	Dec. 31, 2011 2000 Stock Award Plan	Dec. 31, 2011 2008 Equity Plan	Dec. 31, 2011 Stock Option Year	Dec. 31, 2011 Restricted stock units Year	Dec. 31, 2010 Restricted stock units	Dec. 31, 2009 Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plans	3
Maximum number of award to be granted per individual	500,000
Purchase price for each share of common stock as percentage of the average of the market price	90.00%
Shares of common stock issued under the ESPP plan	28,802	30,054	65,005
Weighted-average price of shares of common stock issued under the ESPP plan	$ 29.46	$ 27.87	$ 12.78
Weighted-average estimated fair value of stock options granted	$ 21.39	$ 11.69	$ 3.68
Total intrinsic value of stock options exercised	$ 17.3	$ 26.9	$ 0.5
Maximum number of shares authorized for issuance under stock-based compensation plans								13,000,000	11,000,000
Vesting period for options and restricted stock						4 years	5 years
Maximum expiry period for options							10 years
Maximum aggregate number of shares available under the employee stock purchase plan							800,000
Quarterly contribution of common stock to a trust on behalf of chief executive officer					10,086
Number of shares distributed from the trust				768,018
Weighted-average estimated fair value of restricted stock units granted											$ 45.67	$ 25.32	$ 7.68
Fair value of shares released on vesting of restricted stock units											25.1	12.0	2.5
Total unrecognized compensation cost										$ 6.9	$ 8.5
Weighted-average period of unrecognized compensation cost to be recognized										0.9	1.0