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Related-Party Arrangements - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 6 Months Ended |  |  |  | 1 Months Ended | 6 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |  | 1 Months Ended
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Oct. 31, 2012 | Oct. 31, 2007 | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Feb. 28, 2012 | Aug. 31, 2010 Letter Agreement | Jun. 30, 2013 Loan Arrangement | Jun. 30, 2013 Maximum | Jun. 30, 2013 Minimum | Feb. 28, 2009 Related Party Debt | Dec. 31, 2012 Related Party Debt | Aug. 31, 2010 Related Party Debt Letter Agreement | Feb. 28, 2009 Related Party Debt Loan Arrangement | Dec. 31, 2012 Related Party Debt Loan Arrangement | Jun. 30, 2013 Mann Group | Oct. 31, 2012 Mann Group | Oct. 31, 2012 Mann Group Private Placement
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan agreement with related party |  | $ 350.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% | 3.00% | 5.00% |  |  |
Description of variable rate interest |  |  |  |  |  |  | The interest rate will increase to the one-year LIBOR calculated on the date of the initial advance or in effect on the date of default, whichever is greater, plus 5% per annum. |  |  |  | One-year LIBOR | One-year LIBOR | One-year LIBOR |  |  |  |  |
Borrowing rate |  |  |  |  |  |  |  |  | 5.84% |  |  |  |  |  |  |  |  |
Promissory note maturity date |  |  | Jan. 01, 2014 |  |  |  |  | Jan. 01, 2014 |  |  |  |  |  |  |  |  |  |
Principal amount outstanding under credit facility |  |  | 119.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount available for future borrowings |  |  | 125.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount prepaid for cancellation of indebtedness |  |  |  |  |  |  |  |  | 200.0 |  |  |  |  |  |  |  |  |
Number of months advances outstanding |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |  |
Related party transaction prepayment period |  |  | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Agreed to be Purchased by Lender |  |  |  |  |  | $ 77.2 |  |  |  |  |  |  |  |  |  | $ 78.0 | $ 107.4 |
Capital stock authorized |  |  | 300,869,683 | 286,035,082 | 31,250,000 | 31,250,000 |  |  |  |  |  |  |  |  |  | 31,250,000 |  |
Underwritten public offering | 46,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,000,000
Common stock purchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,000,000
Rate at which warrants are exercisable | 2.60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant expiration month and year | 2013-10 |  | 2013-10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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