Calculations of Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Basic Loss per Common Share:
Net loss	$ (143,011)	$ (2,136)	$ (151,576)	$ (9)
Less: Net loss (income) attributable to non-controlling interests	264	87	(189)	9
Less: Accretion of redemption preference on redeemable convertible non-controlling interest - Netsmart	(10,963)	(8,153)	(21,925)	(8,153)
Net loss attributable to Allscripts Healthcare Solutions, Inc. stockholders	$ (153,710)	$ (10,202)	$ (173,690)	$ (8,153)
Weighted-average common shares outstanding	181,193	186,792	180,981	187,676
Basic Loss per Common Share	$ (0.85)	$ (0.05)	$ (0.96)	$ (0.04)
Diluted Loss per Common Share:
Net loss	$ (143,011)	$ (2,136)	$ (151,576)	$ (9)
Less: Net loss (income) attributable to non-controlling interests	264	87	(189)	9
Less: Accretion of redemption preference on redeemable convertible non-controlling interest - Netsmart	(10,963)	(8,153)	(21,925)	(8,153)
Net loss attributable to Allscripts Healthcare Solutions, Inc. stockholders	$ (153,710)	$ (10,202)	$ (173,690)	$ (8,153)
Weighted-average common shares outstanding	181,193	186,792	180,981	187,676
Plus: Dilutive effect of stock options, restricted stock unit awards and warrants	0	0	0	0
Weighted-average common shares outstanding assuming dilution	181,193	186,792	180,981	187,676
Diluted Loss per Common Share	$ (0.85)	$ (0.05)	$ (0.96)	$ (0.04)