Financing Receivables - Summary of Aging of Financing Receivables (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due (on non-accrual status)	$ 15,308	$ 11,473
Not past due	16,198	8,907
Total financing receivables	31,506	20,380
Chile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due (on non-accrual status)	14,811	10,351
Not past due	15,333	8,494
Total financing receivables	30,144	18,845
Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due (on non-accrual status)	497	1,122
Not past due	865	413
Total financing receivables	1,362	1,535
Amounts past due less than one year
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amount past due	11,632	7,721
Amounts past due less than one year | Chile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amount past due	11,327	6,800
Amounts past due less than one year | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amount past due	305	921
Amounts past due one year or greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amount past due	3,676	3,752
Amounts past due one year or greater | Chile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amount past due	3,484	3,551
Amounts past due one year or greater | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amount past due	$ 192	$ 201