Calculations of Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Basic Loss per Common Share:
Net loss	$ (5,133)	$ (25,763)	$ (18,433)	$ (64,275)
Less: Net income attributable to non-controlling interest	(111)	0	(120)	0
Net loss attributable to Allscripts Healthcare Solutions, Inc. stockholders	$ (5,244)	$ (25,763)	$ (18,553)	$ (64,275)
Weighted-average common shares outstanding	188,944	180,189	183,725	179,691
Basic Loss per Common Share	$ (0.03)	$ (0.15)	$ (0.10)	$ (0.36)
Diluted Loss per Common Share:
Net loss	$ (5,133)	$ (25,763)	$ (18,433)	$ (64,275)
Less: Net income attributable to non-controlling interest	(111)	0	(120)	0
Net loss attributable to Allscripts Healthcare Solutions, Inc. stockholders	$ (5,244)	$ (25,763)	$ (18,553)	$ (64,275)
Weighted-average common shares outstanding	188,944	180,189	183,725	179,691
Dilutive effect of stock options, restricted stock unit awards and warrants	0	0	0	0
Weighted-average common shares outstanding assuming dilution	188,944	180,189	183,725	179,691
Diluted Loss per Common Share	$ (0.03)	$ (0.15)	$ (0.10)	$ (0.36)