Fair Value Measurements and Long-term Investments - Summary of Long-term Equity Investments Included in Other Assets (Detail) $ in Thousands		6 Months Ended
		Jun. 30, 2022 USD ($) Investment	Dec. 31, 2021 USD ($)
Fair Value Disclosures [Abstract]
Equity method investments, Number of Investees | Investment	[1]	4
Cost with adjustments, Number of investees | Investment		7
Total long-term equity investments, Number of Investees | Investment		11
Equity method investments, Original Cost	[1]	$ 7,099
Cost with adjustments, Original Cost		47,114
Total long-term equity investments, Original Cost		54,213
Equity method investments, Carrying Value	[1]	11,579	$ 12,260
Cost with adjustments, Carrying Value		49,109	49,293
Total long-term equity investments, Carrying Value		$ 60,688	$ 61,553

[1] Allscripts share of the earnings of our equity method investees is reported based on a one quarter lag.