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Changes in Operations Australia GRail Fair Values Assigned (Details)
AUD in Thousands, $ in Thousands
12 Months Ended
Dec. 01, 2016
AUD
Dec. 31, 2016
USD ($)
Dec. 01, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Goodwill   $ 1,125,596   $ 826,575 $ 628,815
GRail [Member]          
Accounts receivable AUD 1,556   $ 1,153    
Materials and supplies 411   305    
Property and equipment 279,592   207,206    
Goodwill 415,959   308,267    
Total Assets 1,332,518   987,530    
Accounts payable and accrued expenses 5,771   4,277    
Deferred income tax liabilities, net 190,551   141,217    
Net assets 1,136,196   $ 842,036    
Customer Contracts [Member] | GRail [Member]          
Intangible assets AUD 635,000 $ 470,599