Equity-Based Compensation - Summary of Company's Equity Award Programs (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted at fair market value, Number of Shares	50.5
Partnership Restricted Equity Units (Class A-2) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Number of Shares	102.2
Granted at fair market value, Number of Shares	18.0
Net share settlement, Number of Shares	(11.0)
Forfeited, Number of Shares	(0.7)
Ending Balance, Number of Shares	108.5
Beginning Balance, Weighted Average Grant Date Fair Value	$ 2.08
Granted at fair market value, Weighted Average Grant Date Fair Value	$ 0.06
Net share settlement, Weighted Average Grant Date Fair Value	$ 0.06
Forfeited, Weighted Average Grant Date Fair Value	$ 0.06
Ending Balance, Weighted Average Grant Date Fair Value	$ 1.97
Worldwide Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Number of Shares	1.6
Beginning Balance, Weighted Average Grant Date Fair Value	$ 1.85
Granted at fair market value, Weighted Average Grant Date Fair Value
Granted at fair market value, Number of Shares
Net share settlement, Number of Shares
Forfeited, Number of Shares
Ending Balance, Number of Shares	1.6
Net share settlement, Weighted Average Grant Date Fair Value
Forfeited, Weighted Average Grant Date Fair Value
Ending Balance, Weighted Average Grant Date Fair Value	$ 1.85
Worldwide Equity Plan [Member] \| Restricted Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Number of Shares	0.5
Beginning Balance, Weighted Average Grant Date Fair Value	$ 1.85
Granted at fair market value, Number of Shares	50.6
Net share settlement, Number of Shares
Forfeited, Number of Shares
Ending Balance, Number of Shares	51.1
Granted at fair market value, Weighted Average Grant Date Fair Value	$ 0.37
Net share settlement, Weighted Average Grant Date Fair Value
Forfeited, Weighted Average Grant Date Fair Value
Ending Balance, Weighted Average Grant Date Fair Value	$ 0.38

The weighted average fair value at grant date for actual shares issued during the period.

No definition available.

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- Definition

The number of actual shares, that validly exist and are outstanding as of the balance sheet date.

+ References

No definition available.

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- Definition

The weighted average fair value of actual shares

+ References

No definition available.

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- Definition

The number of fully vested and converted equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

The weighted average fair value of fully vested and converted awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan

+ References

No definition available.

+ Details

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- Definition

The number of awards return back to the company as the company paid taxes for the employees.

+ References

No definition available.

+ Details

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- Definition

The weighted average grant date fair value of awards return back to the company as the company paid taxes for the employees.

+ References

No definition available.

+ Details

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ 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)(1)(iv)(3)

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

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ 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)(3)

-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

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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 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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ 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)(i)-(ii)

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

+ Details

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Data Type:	xbrli:sharesItemType
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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ 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)(i)-(ii)

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

+ Details

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