Annual report pursuant to Section 13 and 15(d)

Components of Interest Expense (Detail)

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Components of Interest Expense (Detail) - USD ($)
4 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Interest Expense [Abstract]        
Interest expense $ 26,462,000 $ 31,257,000 $ 35,811,000 $ 26,462,000
Amortization of debt issuance costs 2 2,736,000 3,339,000 2,611,000  
Amortization of Debt Discount (Premium) 680,000 811,000 743,000  
Interest on borrowings and related fees 32,164,000 29,851,000 36,593,000  
Interest Paid, Capitalized, Investing Activities $ 9,118,000 2,744,000 $ 4,136,000  
Accelerated Deferred Debt Issuance Cost   $ 900,000