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Long Term Debt - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Debt Instrument [Line Items]          
Loss on debt amendments and extinguishments $ (1.5) $ (2.5) $ (1.5) $ (2.5)  
Interest Rate Swap          
Debt Instrument [Line Items]          
Derivative notional amount 175.0   175.0    
Interest Rate Swap Agreements [Member]          
Debt Instrument [Line Items]          
Accumulated gain on swaps amortized to interest expense     1.0    
Derivative notional amount $ 137.5   $ 137.5    
Maturity date     Dec. 31, 2027    
4.50 % Convertible Senior Notes          
Debt Instrument [Line Items]          
Number of shares issued upon settel in convertible notes     17.0    
Number of shares of investment owned 17.0   17.0    
Debt instrument convertible conversation description     the Company provided irrevocable notice to the holders of the 4.50% Convertible Senior Notes of its election to settle all conversion obligations with respect to any 4.50% Convertible Senior Notes that are converted on or after May 15, 2025 by means of Combination Settlement as defined in the indenture to the 4.50% Convertible Senior Notes. Under the Combination Settlement, the Company will repay the $460.0 outstanding principal amount of the 4.50% Convertible Senior Notes on their August 15, 2025 maturity date, in cash. Amounts owed above the $460.0 principal amount of the 4.50% Convertible Senior Notes will be settled in shares. If any conversion would result in the issuance of fractional shares, the Company will pay cash in lieu of such fractional shares. The estimated number of shares to be issued by the Company to settle amounts owed above the principal amount would be approximately 17.0 shares based on the closing price of Holdings’ common stock on June 30, 2025.    
Debt Instrument, Interest Rate, Stated Percentage 4.50%   4.50%    
Senior note convertible debt May 15, 2025   May 15, 2025    
Repay of Outstanding Principal Amount     $ 460.0    
Debt instrument, interest rate, stated percentage 4.50%   4.50%    
Debt Instrument Convertible Latest Date     May 15, 2025    
Amended Senior Secured Credit Facility [Member]          
Debt Instrument [Line Items]          
Amount outstanding under the term loan $ 635.5   $ 635.5    
CUSA [Member]          
Debt Instrument [Line Items]          
Average interest rate on outstanding borrowings 5.80%   5.80%    
Loss on debt amendments and extinguishments $ 1.5 $ 2.5 $ 1.5 $ 2.5  
Debt issuance costs $ 23.8   $ 23.8   $ 26.9
CUSA [Member] | 8.75 % Senior Notes          
Debt Instrument [Line Items]          
Debt instrument, redemption price, percentage     8.75% 8.75%  
Minimum [Member] | 4.50 % Convertible Senior Notes          
Debt Instrument [Line Items]          
Initial conversion price $ 14.27   $ 14.27    
Maximum [Member] | 4.50 % Convertible Senior Notes          
Debt Instrument [Line Items]          
Initial conversion price $ 14.35   $ 14.35    
Term Loan Credit facility | CUSA [Member]          
Debt Instrument [Line Items]          
Debt issuance costs $ 1.0   $ 1.0    
Debt Issuance Costs Capitalized 0.8   0.8    
Legal and Other Fees Related to Debt Extinguishment     0.2    
Unamortized Debt Issuance Expense $ 1.3   1.3    
Term Loan Credit facility | CUSA [Member] | Senior Secured Credit Facility          
Debt Instrument [Line Items]          
Quarterly principal payments due     $ 1.6    
Reduction in Interest Rate 0.50%   0.50%    
Reset Soft Call Intrest Rate 101.00%   101.00%    
Last quarterly payment date     Mar. 31, 2030    
Final principal payment due date     May 24, 2030    
Revolving Credit Line | Amended Senior Secured Credit Facility [Member]          
Debt Instrument [Line Items]          
Amount outstanding under the revolving credit line $ 0.0   $ 0.0