Acquisitions - Schedule of Unaudited Pro Forma Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cisneros Interactive
Pro Forma:
Total revenue		$ 488,137
Net income (loss)		5,257
Net income (loss) attributable to redeemable noncontrolling interest		(5,343)
Net income (loss) attributable to common stockholders		$ (86)
Basic and diluted earnings per share:
Net income (loss) per share, attributable to common stockholders, basic and diluted		$ 0.00
Weighted average common shares outstanding, basic and diluted		84,231,212
MediaDonuts
Pro Forma:
Total revenue	$ 781,835	$ 372,519
Net income (loss) attributable to common stockholders	$ 32,997	$ (522)
Basic and diluted earnings per share:
Net income (loss) per share, attributable to common stockholders, basic	$ 0.39	$ (0.01)
Net income (loss) per share, attributable to common stockholders, diluted	$ 0.38	$ (0.01)
Weighted average common shares outstanding, basic	85,301,603	84,231,212
Weighted average common shares outstanding, diluted	87,910,603	84,231,212
365 Digital
Pro Forma:
Total revenue	$ 762,300	$ 344,965
Net income (loss) attributable to common stockholders	$ 30,642	$ (3,747)
Basic and diluted earnings per share:
Net income (loss) per share, attributable to common stockholders, basic	$ 0.36	$ (0.04)
Net income (loss) per share, attributable to common stockholders, diluted	$ 0.35	$ (0.04)
Weighted average common shares outstanding, basic	85,301,603	84,231,212
Weighted average common shares outstanding, diluted	87,910,603	84,231,212