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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
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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 |  |

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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 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of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(e) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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