XML 122 R102.htm IDEA: XBRL DOCUMENT v3.10.0.1
Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related Party Transactions [Abstract]      
Maximum percentage of interest on amounts due from affiliates 7.50%    
Payment of aircraft related expenses $ 8.4 $ 5.4 $ 4.8