Discontinued operations - Disposal of Discontinued Activity (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Major classes of line items constituting loss from discontinued operations:
Loss from operations of discontinued operations, net of $0 income taxes	$ (2,084)	$ (2,893)
Loss on disposal of discontinued operations, net of $0 income taxes	(19,040)
Net loss from discontinued operations	(21,124)	(2,893)
Discontinued Operations, Disposed of [Member] \| Red Violet, Inc. [Member]
Major classes of line items constituting loss from discontinued operations:
Revenue	3,325	1,572
Cost of revenue (exclusive of depreciation and amortization)	2,017	1,401
Sales and marketing expenses	1,089	818
General and administrative expenses	1,852	2,030
Depreciation and amortization	451	216
Loss from operations of discontinued operations, net of $0 income taxes	(2,084)	(2,893)
Loss on disposal of discontinued operations, net of $0 income taxes	(19,040)
Net loss from discontinued operations	$ (21,124)	$ (2,893)

Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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