Accounts and Notes Receivable and Credit Quality of Notes Receivable - Notes Receivable Concentration Risk (Details) - Geographic concentration risk - Notes receivable	3 Months Ended
	Mar. 31, 2016
Mexico
Concentration Risk [Line Items]
Concentration risk, percentage	20.00%
Peru
Concentration Risk [Line Items]
Concentration risk, percentage	17.00%
Colombia
Concentration Risk [Line Items]
Concentration risk, percentage	7.00%
Australia
Concentration Risk [Line Items]
Concentration risk, percentage	6.00%
Argentina
Concentration Risk [Line Items]
Concentration risk, percentage	6.00%
Other (less than 5% individually)
Concentration Risk [Line Items]
Concentration risk, percentage	15.00%
Concentration risk, individual percentage	0.05
Total international notes receivable as a percentage of total notes receivable
Concentration Risk [Line Items]
Concentration risk, percentage	71.00%