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Share-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares to reduce shares available to grant by upon vesting of restricted stock units	700,000	700,000
Number of shares to reduce shares available to grant by upon vesting of deferred stock units	100,000	100,000
Estimated pretax compensation expense	$ 7.0	$ 7.0
Estimated pretax compensation expenses expiration, years		4 years
Service period in years		4 years
Restricted stock awards settled in stock exercisable in percentage		25.00%
Long-term incentive, cash-based awards		3 years
Restricted stock awards settled in cash exercisable in percentage		25.00%
Stock compensation and recognized liability	0.1	2.4
Fair value of the liability incurred through		1.8
Performance unit award expenses		$ 0
Non-Employee Directors' Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period in years		10 years
Vesting period in years		4
2008 Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [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	5,800,000	5,800,000
Shares issuable upon exercise of outstanding options		4,200,000
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock options exercisable in percentage		25.00%
Service period in years		4 years
Expiration period in years		10 years
Restricted Stock Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period in years		4 years
Long-term incentive, cash-based awards		3 years
Deferred Stock Units to be Settled in Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period in years		3 years

X

- Definition

The number that is multiplied against each share issued that are subject to awards of any stock-based compensation other than stock options and stock appreciation rights which is then subtracted from the available authorized grant pool.

+ References

No definition available.

+ Details

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- Definition

The number that is multiplied against each share issued that are subject to awards of any stock-based compensation other than stock options and stock appreciation rights which is then subtracted from the available authorized grant pool.

+ References

No definition available.

+ Details

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X

- Definition

The yearly percentage that vests for employee stock option grants.

+ References

No definition available.

+ Details

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X

- 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

Number Of Shares To Reduce Shares Available To Grant By Upon Vesting Of Deferred Stock Units

+ References

No definition available.

+ Details

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X

- Definition

Number of shares outstanding which will reduce shares available to grant upon vesting of restricted stock units.

+ References

No definition available.

+ Details

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X

- Definition

Fair value of liability incurred during period on performance unit awards to be settled in cash.

+ References

No definition available.

+ Details

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- Definition

The aggregate amount of expense recorded during the period for long term incentive awards granted to employees not stock-based to be settled in cash.

+ References

No definition available.

+ Details

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X

- Definition

The yearly percentage that vests for restricted stock awards.

+ References

No definition available.

+ Details

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X

- Definition

The yearly percentage that vests for restricted stock units settled in cash.

+ References

No definition available.

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- Definition

The vesting period in years for stock option grants.

+ References

No definition available.

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- Definition

The number of outstanding stock options that upon issuance will be deducted from the available authorized grant pool.

+ References

No definition available.

+ Details

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X

- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ 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 (b)

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



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 710

-SubTopic 10

-Section 30

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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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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-Publisher FASB

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-SubTopic 10

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-Paragraph 2

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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X

- 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.

+ References

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-Topic 718

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