Revenue from Contracts with Customers - Summary of Revenue by Type and Nature of Revenue Stream by Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation Of Revenue [Line Items]
Recurring revenue	$ 304,724			$ 301,616			$ 904,016	$ 914,792
Non-recurring revenue	64,548			64,002			207,322	201,494
Total revenue	369,272	$ 373,714	$ 368,352	365,618	$ 369,304	$ 381,364	1,111,338	1,116,286
Unallocated Amounts [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	6,419			6,915			18,924	18,223
Hospital and Large Physician Practices [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	225,685			233,630			695,427	712,538
Hospital and Large Physician Practices [Member] | Operating Segments [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	225,685			233,630			695,427	712,538
Veradigm [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	137,168			125,073			396,987	385,525
Veradigm [Member] | Operating Segments [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	137,168			125,073			396,987	385,525
Software delivery, Support and Maintenance [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	222,726			219,850			670,840	680,124
Software delivery, Support and Maintenance [Member] | Unallocated Amounts [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	4,842			5,567			14,101	14,476
Software delivery, Support and Maintenance [Member] | Hospital and Large Physician Practices [Member] | Operating Segments [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	104,809			113,112			333,277	351,098
Software delivery, Support and Maintenance [Member] | Veradigm [Member] | Operating Segments [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	113,075			101,171			323,462	314,550
Client services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	146,546			145,768			440,498	436,162
Client services [Member] | Unallocated Amounts [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	1,577			1,348			4,823	3,747
Client services [Member] | Hospital and Large Physician Practices [Member] | Operating Segments [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	120,876			120,518			362,150	361,440
Client services [Member] | Veradigm [Member] | Operating Segments [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 24,093			$ 23,902			$ 73,525	$ 70,975