Summary of Other Equity Investments Included in Other Assets (Detail) $ in Thousands		12 Months Ended
		Dec. 31, 2017 USD ($) Investment	Dec. 21, 2017 USD ($)	Dec. 31, 2016 USD ($)
Investments In Affiliates Subsidiaries Associates And Joint Ventures [Abstract]
Number of Investees | Investment	[1]	3
Equity method investments, Original Investment	[1]	$ 1,658
Equity method investments, Carrying Value	[1]	$ 3,258		$ 2,436
Cost method investments, Number of Investees | Investment		7
Cost method investments, Original Investment			$ 32,784
Cost method investments, Carrying Value			$ 26,755	26,041
Total equity investments, Number of Investees | Investment		10
Total equity investments, Original Investment		$ 34,442
Total equity investments, Carrying Value		$ 30,013		$ 28,477

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