XML 62 R48.htm IDEA: XBRL DOCUMENT v3.10.0.1
Financial Instruments - Schedule of Maintenance Fee Payment to CCKF (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related Party Transactions [Abstract]      
Maintenance Fee Payments $ 1,462 $ 1,371 $ 1,375