Organization and Description of Business (Narrative) (Details)	6 Months Ended
	Jun. 30, 2019 terminal airport segment
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of reportable segments | segment	4
Canada- IMTT
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of marine terminals	2
IMTT
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of marine terminals	17
Atlantic Aviation
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of airport locations | airport	70