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Related-Party Arrangements - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended
Dec. 31, 2012
Oct. 31, 2012
Oct. 31, 2007
Mar. 31, 2013
Jun. 30, 2012
Feb. 28, 2012
Mar. 31, 2013
Loan Arrangement
Aug. 31, 2010
Letter Agreement
Mar. 31, 2013
Maximum
Dec. 31, 2012
Maximum
Mar. 31, 2013
Minimum
Feb. 28, 2009
Related Party Debt
Dec. 31, 2012
Related Party Debt
Dec. 31, 2012
Related Party Debt
Loan Arrangement
Feb. 28, 2009
Related Party Debt
Loan Arrangement
Aug. 31, 2010
Related Party Debt
Letter Agreement
Mar. 31, 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                 4.50% 4.50%                  
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                       $ 107.4  
Capital stock authorized 286,035,082     289,375,250 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