GOODWILL AND OTHER INTANGIBLE ASSETS - Summary of Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Goodwill
Goodwill beginning balance	$ 838,428	$ 840,117
Goodwill ending balance	2,359,674	838,428
Courthouse Technologies, Ltd
Goodwill
Adjustments related to goodwill		(1,689)
NIC
Goodwill
Adjustments related to goodwill	(17,200)
Goodwill acquired	1,446,868
VendEngine
Goodwill
Adjustments related to goodwill	(4,200)
Goodwill acquired	54,456
Other acquisitions
Goodwill
Goodwill acquired	19,922
Enterprise Software
Goodwill
Goodwill beginning balance	824,260	825,949
Goodwill ending balance	898,638	824,260
Enterprise Software \| Courthouse Technologies, Ltd
Goodwill
Adjustments related to goodwill		(1,689)
Enterprise Software \| NIC
Goodwill
Goodwill acquired	0
Enterprise Software \| VendEngine
Goodwill
Goodwill acquired	54,456
Enterprise Software \| Other acquisitions
Goodwill
Goodwill acquired	19,922
Appraisal and Tax
Goodwill
Goodwill beginning balance	14,168	14,168
Goodwill ending balance	14,168	14,168
Appraisal and Tax \| Courthouse Technologies, Ltd
Goodwill
Adjustments related to goodwill		0
Appraisal and Tax \| NIC
Goodwill
Goodwill acquired	0
Appraisal and Tax \| VendEngine
Goodwill
Goodwill acquired	0
Appraisal and Tax \| Other acquisitions
Goodwill
Goodwill acquired	0
NIC
Goodwill
Goodwill beginning balance	0	0
Goodwill ending balance	1,446,868	0
NIC \| Courthouse Technologies, Ltd
Goodwill
Adjustments related to goodwill		$ 0
NIC \| NIC
Goodwill
Goodwill acquired	1,446,868
NIC \| VendEngine
Goodwill
Goodwill acquired	0
NIC \| Other acquisitions
Goodwill
Goodwill acquired	$ 0

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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