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Financial Instruments - Schedule of Maintenance Fee Payment to CCKF (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Related Party Transactions [Abstract]          
Maintenance payments   $ 1,400 $ 338 $ 1,443 [1] $ 1,045
Maintenance expense recognized $ 400     $ 1,200  
[1] During the first quarter of 2020, the Company prepaid approximately $1.4 million of maintenance payments, of which approximately $0.4 million and $1.2 million was recognized as expense for the quarter and year to date ended September 30, 2020, respectively.