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Segment Reporting - Operating Revenue by Principal Geographic Area (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of geographical areas [line items]      
Total operating revenue $ 2,527,556 $ 2,221,852 $ 2,253,710
North America [member]      
Disclosure of geographical areas [line items]      
Total operating revenue 609,954 638,854 559,613
Panama [member]      
Disclosure of geographical areas [line items]      
Total operating revenue 413,495 371,645 374,219
Central America and Caribbean [member]      
Disclosure of geographical areas [line items]      
Total operating revenue 275,341 273,610 289,009
Brazil [member]      
Disclosure of geographical areas [line items]      
Total operating revenue 363,774 245,375 290,613
Colombia [member]      
Disclosure of geographical areas [line items]      
Total operating revenue 197,819 146,138 174,206
Others South America [member]      
Disclosure of geographical areas [line items]      
Total operating revenue $ 667,173 $ 546,230 $ 566,050