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Schedule I - Condensed Financial Information of Registrant Guarantees and Restrictions - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
May 02, 2024
Dec. 31, 2021
May 22, 2017
Condensed Financial Information Of Parent Company Only [Line Items]                  
Cash dividend paid         $ 0 $ 0      
Common Stock [Member]                  
Condensed Financial Information Of Parent Company Only [Line Items]                  
Convertible preferred stock, each stock converted to common stock, shares             1.9717    
Redeemable Convertible Preferred Stock [Member]                  
Condensed Financial Information Of Parent Company Only [Line Items]                  
Temporary equity, shares outstanding   71,403,000     71,403,000 71,417,000   71,442,000  
Cash dividend paid $ 8,600,000 $ 8,600,000 $ 8,600,000            
Parent Company [Member]                  
Condensed Financial Information Of Parent Company Only [Line Items]                  
Restricted net assets of Emerald and subsidiaries exceed consolidated net assets as a percentage       25.00%          
Parent Company [Member] | Common Stock [Member]                  
Condensed Financial Information Of Parent Company Only [Line Items]                  
Convertible preferred stock, each stock converted to common stock, shares             1.9717    
Parent Company [Member] | Redeemable Convertible Preferred Stock [Member]                  
Condensed Financial Information Of Parent Company Only [Line Items]                  
Temporary equity, shares outstanding             0    
Parent Company [Member] | Amended and Restated Senior Secured Credit Facilities [Member]                  
Condensed Financial Information Of Parent Company Only [Line Items]                  
Builder basket percentage based on consolidated net income and certain other amounts                 50.00%
Fixed charge coverage ratio                 200.00%