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Schedule of Components of Net Cash Provided by Operating Activities of Discontinued Operations Consolidated Statements of Cash Flows (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Discontinued Operations And Disposal Groups [Abstract]      
Loss from discontinued operations $ (730) $ (747) $ (475)
Depreciation and amortization     1,647
Net cash (used in) provided by operating activities of discontinued operations   $ (747) $ 1,172