Segment and Geographic Information - Additional Information (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($) Segments	Dec. 31, 2017 USD ($)
Disclosure of operating segments [line items]
Number of reporting segments \| Segments	2
Depreciation and amortization charges	$ 6,911	$ 7,447
Produce [member]
Disclosure of operating segments [line items]
Depreciation and amortization charges	6,154	6,791
Energy [member]
Disclosure of operating segments [line items]
Depreciation and amortization charges	$ 873	$ 795

The amount of depreciation and amortisation expense. Depreciation and amortisation are the systematic allocations of depreciable amounts of assets over their useful lives.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration