Changes in Operations United States - HOG (Details) - Heart of Georgia Railroad [Member]		3 Months Ended
Feb. 07, 2017 carload	Mar. 31, 2017 a port
Business Acquisition, Date of Acquisition Agreement	Feb. 07, 2017
Track Miles Leased \| carload	219
Annual carloads transported \| port		10,000
Annual carloads interchanged with G&W \| a		2,000

Date when the business acquisition agreement was executed, in CCYY-MM-DD format.

No definition available.

Name:	us-gaap_BusinessAcquisitionDateOfAcquisitionAgreement1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration