XML 53 R42.htm IDEA: XBRL DOCUMENT v3.8.0.1
Schedule of Principal Payments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
2018 (remainder) $ 8,380  
2019 16,220  
2020 584,276  
2021 1,334  
2022 251,396  
Thereafter 618,203  
Total debt $ 1,479,809 $ 1,459,000