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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
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