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Equity-Based Compensation - Summary of Restricted Common Stock and Restricted Units Pursuant to Equity Incentive Plans (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeited	(1,508,353)	(1,348,361)	(694)
Granted, Weighted Average Grant Date Fair Value	$ 0.00
2010 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted		360,000
Service Based Vesting [Member] | Restricted Stock [Member] | 2006 Equity Incentive Plan [Member] | 2010 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested, balance	1,574,064
Granted	396,726
Vested	(543,830)
Forfeited	(883,308)
Surrendered	(116,595)
Unvested, balance	427,057
Unvested, Weighted Average Grant Date Fair Value, balance	$ 4.17
Granted, Weighted Average Grant Date Fair Value	$ 1.43
Vested, Weighted Average Grant Date Fair Value	$ 4.47
Forfeited, Weighted Average Grant Date Fair Value	$ 3.75
Surrendered, Weighted Average Grant Date Fair Value	$ 5.00
Unvested, Weighted Average Grant Date Fair Value, balance	$ 1.87
Service Based Vesting [Member] | Restricted Stock Units [Member] | 2006 Equity Incentive Plan [Member] | 2010 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested, balance	40,135
Granted	132,450
Unvested, balance	172,585
Unvested, Weighted Average Grant Date Fair Value, balance	$ 3.26
Granted, Weighted Average Grant Date Fair Value	$ 1.51
Unvested, Weighted Average Grant Date Fair Value, balance	$ 1.92

X

- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were surrendered.

+ References

No definition available.

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Surrender of share based compensation equity awards.

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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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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.

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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).

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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

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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.

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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

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

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

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