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Equity-Based Compensation - Summary of Restricted Common Stock and Restricted Units Pursuant to Equity Incentive Plans (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeited, restricted stock in connection with the separation, release, and repurchase agreements	1,508,353	1,348,361	694
Surrendered, transferred restricted stock	116,595
2009 Equity Award Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Surrendered, transferred restricted stock	116,595
PrinceRidge [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeited, restricted stock in connection with the separation, release, and repurchase agreements	848,742
PrinceRidge [Member] | 2006 Equity Incentive Plan [Member] | 2010 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeited, restricted stock in connection with the separation, release, and repurchase agreements	848,742

X

- Definition

Surrender of restricted stock.

+ References

No definition available.

+ Details

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X

- 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



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)(e)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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