Financing Receivables - Summary of Aging of Financing Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due (on non-accrual status)	$ 12,986	$ 14,926
Not past due	9,991	14,850
Total financing receivables	22,977	29,776
Chile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due (on non-accrual status)	10,351	12,610
Not past due	8,494	11,758
Total financing receivables	18,845	24,368
Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due (on non-accrual status)	2,635	2,316
Not past due	1,497	3,092
Total financing receivables	4,132	5,408
Financing Receivables, Less Than One Year Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amount past due	8,100	9,545
Financing Receivables, Less Than One Year Past Due | Chile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amount past due	6,800	8,711
Financing Receivables, Less Than One Year Past Due | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amount past due	1,300	834
Financing Receivables, More Than One Year Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amount past due	4,886	5,381
Financing Receivables, More Than One Year Past Due | Chile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amount past due	3,551	3,899
Financing Receivables, More Than One Year Past Due | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Amount past due	$ 1,335	$ 1,482