Acquisitions - Schedule of Unaudited Pro Forma Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cisneros Interactive
Pro Forma:
Total revenue	$ 488,137	$ 432,966
Net income (loss)	5,257	(11,403)
Net income (loss) attributable to redeemable noncontrolling interest	(5,343)	(4,071)
Net income (loss) attributable to common stockholders	$ (86)	$ (15,474)
Basic and diluted earnings per share:
Net income (loss) per share, attributable to common stockholders, basic and diluted	$ 0.00	$ (0.18)
Weighted average common shares outstanding, basic and diluted	84,231,212	85,107,301
Smadex
Pro Forma:
Total revenue			$ 307,805
Net income (loss)			$ 13,133
Basic and diluted earnings per share:
Net income per share, basic			$ 0.15
Net income per share, diluted			$ 0.15
Weighted average common shares outstanding, basic			89,115,997
Weighted average common shares outstanding, diluted			90,328,583