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Debt - Long-Term Debt (Detail) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Long term debt $ 640,319,000 $ 643,692,000
Less: Current portion of long-term debt (19,000,000) (19,000,000)
Total long-term debt, net of discount and issuance costs 621,319,000 624,692,000
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Revolving credit facility 0  
Term Loan Due November 22, 2024 [Member] | Term Loan [Member]    
Debt Instrument [Line Items]    
Long term debt 342,291,000 346,091,000
Senior Secured Notes Due February 15, 2025 [Member] | Senior Secured Notes [Member]    
Debt Instrument [Line Items]    
Long term debt $ 298,028,000 $ 297,601,000