Annual report pursuant to Section 13 and 15(d)

Summary of Long-Term Debt (Detail)

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Summary of Long-Term Debt (Detail) - USD ($)
$ in Thousands
4 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Amortization of debt issuance costs 2 $ 1,961 $ 2,611 $ 2,736
Credit facility 2   362,400 321,000
Second Lien Facility   200,000 200,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums   7,372 9,625
Debt Instrument, Unamortized Discount   (2,415) (3,159)
Unamortized Debt Issuance Expense   (4,957) (6,466)
Long-term Debt   562,400 521,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   $ 555,028 $ 511,375
Second Lien Facility [Member]      
Debt Instrument [Line Items]      
Credit facility interest rate option one, applicable margin rate over Adjusted LIBOR   7.00%  
Second Lien Facility, Interest Rate   8.81%