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Financial Instruments - Schedule of Maintenance Fee Payment to CCKF (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Related Party Transactions [Abstract]          
Maintenance payments   $ 1,400 $ 359 $ 1,443 [1] $ 707
Maintenance expense recognized $ 400     $ 800  
[1] During the first quarter of 2020, the Company prepaid approximately $1.4 million of maintenance payments, of which approximately $0.4 million and $0.8 million was recognized as expense for the quarter and year to date ended June 30, 2020, respectively.