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Debt - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Dec. 19, 2025
Jul. 25, 2025
May 22, 2025
Jan. 09, 2025
Mar. 31, 2027
Dec. 31, 2026
Sep. 30, 2026
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Jul. 12, 2022
Debt Instrument [Line Items]                            
Document Period End Date                     Jun. 30, 2025      
Line of Credit Facility, Maximum Borrowing Capacity                 $ 36,700,000   $ 36,700,000      
Accumulated amortization                 19,893,000   19,893,000   $ 17,797,000  
Deferred debt issuance costs, less accumulated amortization                 11,047,000   11,047,000   14,729,000  
Debt Issuance Costs, Gross       $ 1,200,000         30,940,000   30,940,000   32,526,000  
Long-Term Debt, Maturity, Year Two                 37,500,000   37,500,000      
Long-Term Debt, Maturity, Year Five                 1,000,000,000   1,000,000,000      
Long-Term Debt, Maturity, after Year Five                 300,000,000   300,000,000      
Borrowings - revolving credit facility                     73,500,000 $ 237,000,000    
Borrowings From Subsidiary, Current                 183,959,000   183,959,000   $ 169,765,000  
Management fees                 19,035,000 $ 18,739,000 37,898,000 36,681,000    
Gain (Loss) on Extinguishment of Debt                 2,827,000 $ 0 2,827,000 $ 0    
Management Service Agreement With CGM                            
Debt Instrument [Line Items]                            
Management fees                 14,000,000          
Maximum | Management Service Agreement With CGM | Corporate Segment                            
Debt Instrument [Line Items]                            
Management fees     $ 10,500,000                      
Maximum | Management Service Agreement With CGM | Corporate Segment | Subsequent Event                            
Debt Instrument [Line Items]                            
Management fees $ 15,000,000 $ 5,000,000                        
Letter of Credit                            
Debt Instrument [Line Items]                            
Letter of credit outstanding                 $ 3,300,000   $ 3,300,000      
Letter of Credit | 2022 Credit Facility                            
Debt Instrument [Line Items]                            
Credit facility obtained                           $ 100,000,000
2022 Credit Facility | Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Line of Credit Facility, Maximum Borrowing Capacity     600,000,000                     $ 250
2022 Credit Facility | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum                            
Debt Instrument [Line Items]                            
Debt Instrument, Interest Rate, Stated Percentage                           1.50%
2022 Credit Facility | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum                            
Debt Instrument [Line Items]                            
Debt Instrument, Interest Rate, Stated Percentage                           2.50%
2022 Credit Facility | Revolving Credit Facility | Fed Funds Effective Rate Overnight Index Swap Rate                            
Debt Instrument [Line Items]                            
Debt Instrument, Interest Rate, Stated Percentage                           0.50%
2022 Credit Facility | Revolving Credit Facility | Eurodollar                            
Debt Instrument [Line Items]                            
Debt Instrument, Interest Rate, Stated Percentage                           1.00%
2022 Credit Facility | Revolving Credit Facility | Base Rate | Minimum                            
Debt Instrument [Line Items]                            
Debt Instrument, Interest Rate, Stated Percentage                           0.50%
2022 Credit Facility | Revolving Credit Facility | Base Rate | Maximum                            
Debt Instrument [Line Items]                            
Debt Instrument, Interest Rate, Stated Percentage                           1.50%
2022 Credit Facility | Term Loan | Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Line of Credit Facility, Maximum Borrowing Capacity                           $ 400,000,000
2022 Credit Facility | Line of Credit | Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Line of Credit Facility, Maximum Borrowing Capacity     100,000,000 100,000,000                   600,000,000
2022 Credit Facility | 2022 Term Loan | Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Line of Credit Facility, Maximum Borrowing Capacity       $ 200,000,000                    
2022 Credit Facility | 2022 Term Loan | Revolving Credit Facility | Minimum                            
Debt Instrument [Line Items]                            
Debt Instrument, Interest Rate, Stated Percentage       0.625%                    
Debt Instrument, Periodic Payment       $ 3,750,000                    
Debt instrument, Fee Percentage       0.25%                    
2022 Credit Facility | 2022 Term Loan | Revolving Credit Facility | Maximum                            
Debt Instrument [Line Items]                            
Debt Instrument, Interest Rate, Stated Percentage       1.875%                    
Debt Instrument, Periodic Payment       $ 11,250,000                    
Debt instrument, Fee Percentage       0.45%                    
Swing line loan | 2022 Credit Facility                            
Debt Instrument [Line Items]                            
Credit facility obtained                           $ 25,000,000
Lugano Financing Arrangements                            
Debt Instrument [Line Items]                            
Debt Instrument, Interest Rate, Effective Percentage                 17.24%   17.24%   11.43%  
Fifth Amendment to Credit Agreement | Subsequent Event                            
Debt Instrument [Line Items]                            
Debt Instrument, Periodic Payment         $ 9,500,000 $ 8,000,000 $ 6,500,000 $ 5,000,000            
Fifth Amendment to Credit Agreement | Revolving Credit Facility | Subsequent Event                            
Debt Instrument [Line Items]                            
Line of Credit Facility, Maximum Borrowing Capacity $ 100,000,000                          
Fifth Amendment to Credit Agreement | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum | Subsequent Event                            
Debt Instrument [Line Items]                            
Debt Instrument, Interest Rate, Stated Percentage 1.50%                          
Fifth Amendment to Credit Agreement | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum | Subsequent Event                            
Debt Instrument [Line Items]                            
Debt Instrument, Interest Rate, Stated Percentage 3.25%                          
Fifth Amendment to Credit Agreement | Revolving Credit Facility | Base Rate | Minimum | Subsequent Event                            
Debt Instrument [Line Items]                            
Debt Instrument, Interest Rate, Stated Percentage 0.50%                          
Fifth Amendment to Credit Agreement | Revolving Credit Facility | Base Rate | Maximum | Subsequent Event                            
Debt Instrument [Line Items]                            
Debt Instrument, Interest Rate, Stated Percentage 2.25%                          
First Forbearance Agreement | Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Line of Credit Facility, Maximum Borrowing Capacity     $ 100,000,000                      
Debt Instrument, Interest Rate, Stated Percentage     2.50%                      
Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Debt Instrument, Interest Rate, Effective Percentage                     7.62%