Acquisitions - Schedule of Unaudited Pro Forma Information (Detail) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) $ / shares shares
MediaDonuts
Pro Forma:
Total revenue | $	$ 158,477
Net income (loss) attributable to common stockholders | $	$ 6,589
Basic and diluted earnings per share:
Net income (loss) per share, attributable to common stockholders, basic and diluted | $ / shares	$ 0.08
Weighted average common shares outstanding, basic | shares	85,041,628
Weighted average common shares outstanding, diluted | shares	86,986,581
365 Digital
Pro Forma:
Total revenue | $	$ 149,231
Net income (loss) attributable to common stockholders | $	$ 5,452
Basic and diluted earnings per share:
Net income (loss) per share, attributable to common stockholders, basic and diluted | $ / shares	$ 0.06
Weighted average common shares outstanding, basic | shares	85,041,628
Weighted average common shares outstanding, diluted | shares	86,986,581