Debt - Additional Information (Detail)										1 Months Ended		12 Months Ended
	Dec. 31, 2020 USD ($)	Oct. 29, 2020 USD ($)	Jul. 20, 2020 USD ($)	Jul. 01, 2020	Dec. 20, 2019 USD ($)	Dec. 09, 2019 USD ($) $ / shares	Aug. 07, 2019 USD ($)	Feb. 15, 2018 USD ($)	Jun. 18, 2013 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2021 USD ($) TradingDay $ / shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2013 USD ($)
Debt Instrument [Line Items]
Maturity date												Jul. 01, 2020
Debt issuance costs												$ 0	$ 758,000	$ 5,445,000
Maximum percentage of foreign subsidiary capital stock guaranteeing credit facility												65.00%
Debt instrument principal amount	$ 167,853,000											$ 342,853,000	167,853,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Portion of facility available for issuance								$ 50,000,000
Swing Loans [Member]
Debt Instrument [Line Items]
Portion of facility available for issuance								10,000,000
Foreign Currencies [Member]
Debt Instrument [Line Items]
Portion of facility available for issuance								100,000,000
Maximum [Member] | Second Amended Credit Agreement [Member]
Debt Instrument [Line Items]
Leverage ratio												425.00%
Maximum [Member] | Second Amended Credit Agreement [Member] | Covenant On Potential Acquisition [Member]
Debt Instrument [Line Items]
Leverage ratio												450.00%
Minimum [Member] | Second Amended Credit Agreement [Member]
Debt Instrument [Line Items]
Interest coverage ratio												350.00%
Minimum [Member] | Second Amended Credit Agreement [Member] | Covenant On Potential Acquisition [Member]
Debt Instrument [Line Items]
Consideration to be paid for acquisitions												$ 100,000,000
0.875% Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 207,900,000				$ 18,000,000.0	$ 200,000,000.0					$ 218,000,000.0	$ 207,911,000	$ 207,900,000	$ 218,000,000.0
Interest rate	0.875%					0.875%				0.875%	0.875%	0.875%	0.875%	0.875%
Interest payment, terms													The 0.875% Notes are Allscripts’ senior, unsecured obligations that bear interest at a rate of 0.875% per year, payable semiannually in arrears on January 1 and July 1 of each year
Debt instrument payment commencement date						Jul. 01, 2020
Maturity date						Jan. 01, 2027					Jan. 01, 2027
Debt instrument convertible, principal amount						$ 1,000						$ 10,900,000
Convertible number of equity instrument						75.0962
Conversion price per common stock | $ / shares						$ 13.32					$ 13.32			$ 13.32
Percentage of common stock sale price for initial conversion price						32.50%
Common stock sale price per share | $ / shares						$ 10.05					10.05			$ 10.05
Debt instrument convertible, principal amount						$ 1,000
Repurchase percentage on principal						100.00%
Initial cap price of capped call transactions | $ / shares											$ 17.5875
Cap interest rate											75.00%			75.00%
Proceeds from debt					17,500,000						$ 195,000,000.0
Debt instrument, initial purchaser's discounts deduction amount											5,000,000.0
Net proceeds used to payments for capped call transactions cost					1,400,000	$ 15,800,000
Repayment of outstanding borrowing						$ 179,200,000
Debt issuance costs					$ 500,000
Debt issuance costs incurred											$ 700,000
Percentage of interest rate used to to compute the initial fair value of the liability component											1.95%
Debt instrument, initial fair value of liability component											$ 177,900,000			$ 177,900,000
Payments for repurchase debt instrument										$ 7,700,000
Debt instrument aggregate principal amount repurchased										10,100,000
Gain on repurchase of debt instrument										500,000
Proceeds due to termination of capped call transaction										300,000
Reduction to capped call fees										800,000
Loss in capped call										$ 500,000
Debt instrument, net carrying value of equity component												10,900,000
Debt instrument principal amount	$ 167,853,000											167,853,000	$ 167,853,000
0.875% Convertible Senior Notes [Member] | Additional Paid-In Capital [Member]
Debt Instrument [Line Items]
Debt instrument convertible, principal amount	40,058,000										40,100,000	$ 40,058,000	40,058,000	$ 40,100,000
Payments of capped call fees											17,200,000
Debt discounts and issuance costs											$ 1,100,000
0.875% Convertible Senior Notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Percentage of aggregate principal amount required to be held by trustee or holders to declare notes immediately due and payable						25.00%
0.875% Convertible Senior Notes [Member] | Condition One [Member]
Debt Instrument [Line Items]
Threshold trading days | TradingDay												20
Threshold consecutive trading days | TradingDay												30
Debt instrument conversion price percentage												130.00%
0.875% Convertible Senior Notes [Member] | Condition Two [Member]
Debt Instrument [Line Items]
Threshold trading days | TradingDay												5
Threshold consecutive trading days | TradingDay												5
Debt instrument conversion price percentage												98.00%
Debt instrument convertible, principal amount												$ 1,000
Senior Secured Revolving Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity								$ 900,000,000
Senior secured credit facilities term, years								5 years
Fees and other costs, incurred			$ 1,400,000				$ 800,000
Credit facility borrowing capacity, amount available												724,000,000.0
Senior Secured Revolving Facility [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Initial margin for borrowings								1.00%
Senior Secured Revolving Facility [Member] | Eurocurrency Rate [Member]
Debt Instrument [Line Items]
Initial margin for borrowings								2.00%
Senior Secured Revolving Facility [Member] | Second Amended Credit Agreement [Member]
Debt Instrument [Line Items]
Debt instrument principal amount												$ 175,000,000.0
Senior Secured Revolving Facility [Member] | Maximum [Member] | Second Amended Credit Agreement [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Senior secured credit facility interest rate spread								1.25%
Senior Secured Revolving Facility [Member] | Maximum [Member] | Second Amended Credit Agreement [Member] | Eurocurrency Rate [Member]
Debt Instrument [Line Items]
Senior secured credit facility interest rate spread								2.25%
Senior Secured Revolving Facility [Member] | Minimum [Member] | Second Amended Credit Agreement [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Senior secured credit facility interest rate spread								0.50%
Senior Secured Revolving Facility [Member] | Minimum [Member] | Second Amended Credit Agreement [Member] | Eurocurrency Rate [Member]
Debt Instrument [Line Items]
Senior secured credit facility interest rate spread								1.50%
Senior Secured Term Loan [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity								$ 400,000,000
Senior secured credit facilities term, years								5 years
Line of credit facility, frequency of payments												The Term Loan is repayable in quarterly installments, which commenced on June 30, 2018.
Senior Secured Term Loan [Member] | Second Amended Credit Agreement [Member] | EPSi Purchase Agreement [Member]
Debt Instrument [Line Items]
Prepayment of debt		$ 19,000,000.0
Senior Secured Term Loan [Member] | Second Amended Credit Agreement [Member] | CarePort [Member]
Debt Instrument [Line Items]
Prepayment of debt	161,000,000.0
Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Aggregate amount of additional credit facilities authorized								$ 600,000,000
Debt instrument principal amount	$ 0											$ 175,000,000	$ 0
Senior Secured Credit Facility [Member] | Second Amended Credit Agreement [Member]
Debt Instrument [Line Items]
Letters of credit outstanding												$ 1,000,000.0
Senior Secured Credit Facility [Member] | Second Amended Credit Agreement [Member] | United States dollars [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, effective percentage												0.60%
Senior Secured Credit Facility [Member] | Second Amended Credit Agreement [Member] | LIBOR Rate [Member]
Debt Instrument [Line Items]
Senior secured credit facility interest rate spread												0.50%
1.25% Cash Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument principal amount									$ 345,000,000.0
Interest rate				1.25%					1.25%		1.25%	1.25%		1.25%
Maturity date				Jul. 01, 2020								Jul. 01, 2020
Conversion price per common stock | $ / shares												$ 17.19
Proceeds from debt									$ 305,100,000
Payments for 1.25% Call Option															$ 82,800,000