GOODWILL AND INTANGIBLE ASSETS - Changes in Carrying Amount of Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2023 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 1,727,852
Additions from acquisitions	29,127
Adjustments to prior year acquisitions	861
Effect of foreign currency translation	9,640
Ending balance	1,767,480
Full service center-based child care
Goodwill [Roll Forward]
Beginning balance	1,481,936
Additions from acquisitions	29,127
Adjustments to prior year acquisitions	861
Effect of foreign currency translation	8,547
Ending balance	1,520,471
Back-up care
Goodwill [Roll Forward]
Beginning balance	206,073
Additions from acquisitions	0
Adjustments to prior year acquisitions	0
Effect of foreign currency translation	1,093
Ending balance	207,166
Educational advisory and other services
Goodwill [Roll Forward]
Beginning balance	39,843
Additions from acquisitions	0
Adjustments to prior year acquisitions	0
Effect of foreign currency translation	0
Ending balance	$ 39,843