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Acquisition of PEG Partners, LLC - Schedule of consolidated statements of operations includes revenues and net income from PEG (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]                
Net income (loss) $ (1,037) $ (560) $ (3,444) $ (1,502) $ (1,597) $ (4,946) $ (11,086) $ 12,068
Net loss attributable to non-controlling interests 28   (157)   207 46 (42) (716)
Net loss attributable to parent $ (1,066)   $ (3,287)   $ (1,804) $ (4,991) (11,044) 12,784
PEG Partners LLC [Member]                
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]                
Revenue             24,028 12,411
Net income (loss)             (209) (3,582)
Net loss attributable to non-controlling interests             (42) (716)
Net loss attributable to parent             $ (168) $ (2,866)