XML 118 R106.htm IDEA: XBRL DOCUMENT v3.10.0.1
Debt - Changes in Liabilities Arising from Financing Activities (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about borrowings [line items]      
Debt including current maturities $ 1,184,132    
Payments on loans, borrowings and finance leases (246,349) $ (326,965) $ (221,912)
Proceeds from new borrowings 147,798 164,400 $ 130,000
Non-cash transactions 89,000    
Debt including current maturities 1,174,581 1,184,132  
Obligations under finance leases [member]      
Disclosure of detailed information about borrowings [line items]      
Debt including current maturities 461,797    
Payments on loans, borrowings and finance leases (28,107)    
Non-cash transactions 89,000    
Debt including current maturities 522,690 461,797  
Debt [member]      
Disclosure of detailed information about borrowings [line items]      
Debt including current maturities 722,335    
Payments on loans, borrowings and finance leases (218,242)    
Proceeds from new borrowings 147,798    
Debt including current maturities $ 651,891 $ 722,335