Share-Based Compensation (Narrative) (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Mar. 31, 2012	Jun. 30, 2012
Share-Based Compensation [Line Items]
Number of shares to reduce shares available to grant by upon vesting of restricted stock units		1,300,000
Estimated compensation expense		$ 20.0
Estimated compensation expense, recognition period, years		four
Restricted stock units awarded	1,317,000	1,348,000
Employee Stock Option [Member]
Share-Based Compensation [Line Items]
Employee stock options exercisable in percentage		25.00%
Service period, years		4 years
Expiration period, years		10
Non-Employee Directors' Stock Options [Member]
Share-Based Compensation [Line Items]
Expiration period, years		10
Restricted Stock Shares [Member]
Share-Based Compensation [Line Items]
Service period, years		4 years
Restricted stock awards exercisable in percentage		25.00%
Vesting period in years		3 years
2008 Incentive Compensation Plan [Member]
Share-Based Compensation [Line Items]
Common stock subject to awards of stock options or stock appreciation rights payable in shares		1.0
Common stock subject to any other form of award		1.67
Common stock available for future share-based awards		6,400,000

Common stock available for future share-based awards.

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- Definition

Common stock subject to awards of restricted stock, restricted stock units, deferred stock, performance units, annual incentive awards and substitute awards, payable in shares.

+ References

No definition available.

+ Details

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- Definition

Common stock subject to awards of stock options or stock appreciation rights payable in shares.

+ References

No definition available.

+ Details

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- Definition

The yearly percentage that vests for employee stock option grants.

+ References

No definition available.

+ Details

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- Definition

The number of years over which estimated share-based compensation expense for all unvested share-based awards that have been granted to participants will be recognized.

+ References

No definition available.

+ Details

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- Definition

The future estimated share-based compensation expense to be recognized for all unvested share-based awards that have been granted to participants, including both stock options and shares of restricted stock.

+ References

No definition available.

+ Details

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- Definition

Number of shares to reduce shares available to grant by upon vesting of restricted stock units.

+ References

No definition available.

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- Definition

The yearly percentage that vests for restricted stock awards.

+ References

No definition available.

+ Details

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Non Employee Director Expiration Period

+ References

No definition available.

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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Period 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, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The number of grants made 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 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

Reference 2: 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.

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