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Fair Value Measurements - Summary of Estimated Fair Values of Long-term Debt Instruments, Warrant Liability and Interest Rate Cap Agreement (Detail) - 2015 Senior Credit Facility, as amended - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
2015 Senior Credit Facility, as amended $ 145,000  
Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
2015 Senior Credit Facility, as amended 143,731 $ 158,386
Book Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
2015 Senior Credit Facility, as amended $ 143,731 $ 158,386