Stock Award Plans - Additional Information (Detail) (USD $)	9 Months Ended
Sep. 30, 2011 Year Location
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Maximum shares that can be granted under stock plan	28,000,000
Shares available for stock awards	7,095,325
Stock award, contractual lives of options	10
Stock award, vesting rights	Options vested over a five-year period from the date of grant, with none vesting the first year and one quarter vesting each year after that
Stock award, vesting period	5 years
Restricted stock awards, discount for post-vesting holding restriction, lower limit	12.00%
Restricted stock awards, discount for post-vesting holding restriction, upper limit	22.00%
Restricted stock awards, unrecognized compensation expense	$ 137,200,000
Maximum employee contribution to purchase company stock	$ 10,000
Discount rate used to determine the purchase price	15.00%
Restricted Stock Awards
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Stock award, vesting period	5 years

Compensation Related Costs Share Based Payments Disclosure [Line Items]

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Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Discount for Postvesting Restrictions Range, Lower Limit

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Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Discount for Postvesting Restrictions Range, Upper Limit

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- Definition

Share based Compensation Arrangement by Share based Payment Award, Maximum Contribution Per Employee

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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

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph h

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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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

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

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-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

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- Definition

Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

+ References

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- Definition

The discount rate from market value on purchase date that participants pay for shares.

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- Definition

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.D.2)

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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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

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph a

-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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- Definition

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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