Investments in Associated Companies - Foreign Currency (Details) - VEF / $	Dec. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2014
CADIVI [Member]
Schedule Of Foreign Currency [Line Items]
Venezuela Currency Exchange Rate				6.3
SIMADI [Member]
Schedule Of Foreign Currency [Line Items]
Venezuela Currency Exchange Rate			193
DIPRO [Member]
Schedule Of Foreign Currency [Line Items]
Venezuela Currency Exchange Rate		10
DICOM [Member]
Schedule Of Foreign Currency [Line Items]
Venezuela Currency Exchange Rate	3,341