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Related-Party Arrangements - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 9 Months Ended 9 Months Ended 1 Months Ended 1 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Oct. 31, 2012
Sep. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Feb. 29, 2012
Feb. 28, 2012
Sep. 30, 2013
Maximum
Sep. 30, 2013
Minimum
Nov. 02, 2013
Subsequent Event
Sep. 30, 2010
Letter Agreement
Sep. 30, 2010
Related Party Debt
Letter Agreement
Sep. 30, 2013
Mann Group
Oct. 31, 2012
Mann Group
Oct. 31, 2013
Mann Group
Subsequent Event
Oct. 31, 2012
Mann Group
Private Placement
Feb. 28, 2009
Principal stockholder
Oct. 31, 2007
Principal stockholder
Sep. 30, 2013
Principal stockholder
Dec. 31, 2012
Principal stockholder
Oct. 31, 2013
Principal stockholder
Subsequent Event
Feb. 28, 2009
Principal stockholder
Loan Arrangement
Dec. 31, 2012
Principal stockholder
Loan Arrangement
Oct. 31, 2013
Principal stockholder
Amended Agreement
Subsequent Event
Related Party Transaction [Line Items]                                              
Loan agreement with related party                                 $ 350.0     $ 370.0      
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. 05, 2020
Principal indebtedness cancelled under the loan arrangement as payment for the aggregate exercise price of The Mann Group Warrants                           78.0                 78.0
Accrued interest that became due and payable upon cancellation of the of principal indebtedness, to be capitalized                                             7.9
Principal amount outstanding under credit facility   119.6                                          
Amount available for future borrowings                 30.1                            
Amount prepaid for cancellation of indebtedness             200.0                                
Number of months advances outstanding               12 months                              
Related party transaction prepayment period   90 days                                          
Aggregate principal amount cancelled                 105.0                            
Restricted Stock Agreed to be Purchased by Lender           $ 77.2             $ 107.4                    
Capital stock authorized   309,993,285 286,035,082 31,250,000   31,250,000           31,250,000                      
Underwritten public offering 46,000,000                           40,000,000                
Number of shares represented by purchased warrants                             30,000,000                
Rate at which warrants are exercisable 2.60       2.40                                    
Warrant expiration month and year 2013-10