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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

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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. + Details
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- Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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. + Details
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