GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Goodwill (Detail) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)
Goodwill activity
Beginning balance	$ 180,424	$ 173,904	$ 123,767
Additions from acquisitions		6,520	50,137
Impairment		0	0
Ending balance		180,424	173,904
Assets acquired
Intangible assets acquired		$ 2,500	3,200
Number of reporting units | segment		1
Intangible assets		$ 718,799	$ 670,146
Weighted average amortization period		4 years 8 months 12 days
2020 Acquisitions
Assets acquired
Number of acquisitions during the period | item	2
Purchase consideration	$ 70,500