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Organization - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Secured project related notes, mature on March 15, 2019	$ 1,800
Notes payable to affiliates	$ 4,903	$ 14,893
Notes payable maturity	2019

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Long term debt maturities repayments of principal in next three months.

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Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

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